{"product_id":"elkhart-plastics-28-gallon-rv-holding-tank-55-3-4-x-23-3-4-x-8-5523-h879003","title":"Elkhart Plastics - 28 Gallon RV Holding Tank - 55-3\/4\" x 23-3\/4\" x 8\" - EPI 5523 \/ H879003","description":"\u003cdiv style=\"background:#f3f4f6;border-left:4px solid #1d9bf0;padding:16px;margin-bottom:12px;\"\u003e\u003cstrong style=\"color:#1d9bf0;\"\u003e✓ ElkhartRVParts.com - The Only Authorized Place for Elkhart Plastics \/ Ameri-Kart\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"background:#f3f4f6;border-left:4px solid #10b981;padding:16px;margin-bottom:20px;\"\u003e\u003cstrong style=\"color:#10b981;\"\u003e✓ 100% Verified Authentic OEM Grade Part\u003c\/strong\u003e\u003c\/div\u003e\n\n\u003cp\u003eFinding a reliable 28 gallon RV holding tank that fits your rig and lasts for years is harder than it should be — until now. The Elkhart Plastics EPI 5523 \/ H879003 is a roto-molded, OEM-grade black or gray water holding tank engineered for the demands of full-time RV life. At 55-3\/4\" x 23-3\/4\" x 8\", it's a direct-fit replacement for a wide range of Class A, Class C, and fifth-wheel applications.\u003c\/p\u003e\n\n\u003ch2\u003eFeatures \u0026amp; Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacity:\u003c\/strong\u003e 28 gallons — ideal mid-size holding tank for most RV configurations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 55-3\/4\" L x 23-3\/4\" W x 8\" H\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness:\u003c\/strong\u003e 0.180\" black high-density polyethylene (HDPE)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutlet:\u003c\/strong\u003e Standard 3\" outlet included; additional fittings available per quote\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Seamless roto-molded design — uniform wall thickness, no weak spots\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black polyethylene — UV-resistant, impact-resistant, odor-resistant\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Numbers:\u003c\/strong\u003e EPI 5523 \/ H879003\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Elkhart Plastics \/ Ameri-Kart — industry-leading OEM tank supplier\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose the Elkhart Plastics 28 Gallon RV Holding Tank?\u003c\/h2\u003e\n\u003cp\u003eElkhart Plastics has built its reputation on one thing: tanks that don't fail. The roto-molding process used to manufacture this 28 gallon RV holding tank creates a seamless, one-piece shell with walls of equal thickness throughout. There are no seams to crack, no joints to leak, and no thin spots to worry about on rough roads.\u003c\/p\u003e\n\u003cp\u003eUnlike aftermarket alternatives, this OEM-grade holding tank meets strict quality and health safety standards — the same standards used by major RV manufacturers. Whether you're replacing a failed tank or upgrading an aging system, the EPI 5523 delivers the fit, finish, and durability you need.\u003c\/p\u003e\n\u003cp\u003eThe standard 3\" outlet is compatible with most RV waste plumbing configurations, and custom fittings can be added per quote for non-standard setups.\u003c\/p\u003e\n\n\u003ch2\u003eCompare RV Holding Tanks by Capacity\u003c\/h2\u003e\n\u003cp\u003eNot sure if 28 gallons is the right size for your rig? Use this comparison to find the best fit for your RV's waste system layout and travel style.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-family:sans-serif;font-size:14px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background:#dc2626;color:#fff;\"\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border:1px solid #e5e7eb;\"\u003eModel \/ Part #\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border:1px solid #e5e7eb;\"\u003eCapacity\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border:1px solid #e5e7eb;\"\u003eDimensions (L x W x H)\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border:1px solid #e5e7eb;\"\u003eBrand\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border:1px solid #e5e7eb;\"\u003eBest For\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border:1px solid #e5e7eb;\"\u003eView Details\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"border-left:3px solid #dc2626;background:#fef2f2;\"\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e\u003cstrong\u003eEPI 5523 \/ H879003\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e\u003cstrong\u003e28 gal\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e\u003cstrong\u003e55-3\/4\" x 23-3\/4\" x 8\"\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eElkhart Plastics\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eMid-size Class A\/C, fifth-wheels\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e\u003cstrong\u003eCurrent Product\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e4283 \/ ERV121100\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e24 gal\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e70\" x 21\" x 6\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eElkhart Plastics\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eSlim-profile, long-bay RVs\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e\u003ca href=\"\/products\/elkhart-24-gallon-rv-holding-tank-70x20x6-4283\" style=\"color:#dc2626;font-weight:bold;\"\u003eView Details\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f9fafb;\"\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eH1296\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e29 gal\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e45\" x 15-1\/2\" x 12-3\/8\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eElkhart Plastics\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eCompact bays, taller clearance\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e\u003ca href=\"\/products\/elkhart-plastics-29-gallon-rv-holding-tank-h1296-45x15-5x12-375\" style=\"color:#dc2626;font-weight:bold;\"\u003eView Details\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eEPI 4676\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e32 gal\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e55\" x 27\" x 8\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eElkhart Plastics\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eLarger rigs, extended trips\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e\u003ca href=\"\/products\/rv-tanks32-gallon-rv-holding-tank-55-x-27-x-8\" style=\"color:#dc2626;font-weight:bold;\"\u003eView Details\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f9fafb;\"\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eVR32546HBLANK\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e32 gal\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e55\" x 32\" x 5-3\/4\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eAlpha\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eWide, low-profile bays\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e\u003ca href=\"\/products\/alpha-32-gallon-rv-holding-tank-vr32546hblank-55x32x5-75\" style=\"color:#dc2626;font-weight:bold;\"\u003eView Details\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp style=\"font-size:13px;color:#6b7280;margin-top:8px;\"\u003e\u003cem\u003eTip: Always measure your existing tank bay (length, width, and height clearance) before ordering. A tank that's even 1\" too tall or wide won't fit without modification.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacity:\u003c\/strong\u003e 28 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 55-3\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 23-3\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness:\u003c\/strong\u003e 0.180\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black high-density polyethylene (HDPE)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutlet Size:\u003c\/strong\u003e 3\" standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdditional Fittings:\u003c\/strong\u003e Available per quote\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturing Process:\u003c\/strong\u003e Roto-molded (seamless, uniform wall thickness)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Numbers:\u003c\/strong\u003e EPI 5523 \/ H879003\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e USA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShip Weight:\u003c\/strong\u003e ~77 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1x Elkhart Plastics 28 Gallon RV Holding Tank (EPI 5523 \/ H879003)\u003c\/li\u003e\n\u003cli\u003eStandard 3\" outlet fitting\u003c\/li\u003e\n\u003cli\u003eManufacturer quality assurance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: Additional fittings, mounting hardware, and hoses are not included but are available — contact us for a quote.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eCompatible Models \u0026amp; Alternatives\u003c\/h2\u003e\n\u003cp\u003eThis 28 gallon RV holding tank is compatible with a wide range of RV makes and models. Browse related options:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/elkhart-24-gallon-rv-holding-tank-70x20x6-4283\" style=\"color:#dc2626;\"\u003e24 Gallon RV Holding Tank - EPI 4283 \/ ERV121100\u003c\/a\u003e — slim 70\" profile\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/elkhart-plastics-29-gallon-rv-holding-tank-h1296-45x15-5x12-375\" style=\"color:#dc2626;\"\u003e29 Gallon RV Holding Tank - H1296\u003c\/a\u003e — compact bay, taller clearance\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/rv-tanks32-gallon-rv-holding-tank-55-x-27-x-8\" style=\"color:#dc2626;\"\u003e32 Gallon RV Holding Tank - EPI 4676\u003c\/a\u003e — step up in capacity\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/alpha-32-gallon-rv-holding-tank-vr32546hblank-55x32x5-75\" style=\"color:#dc2626;\"\u003e32 Gallon Alpha Holding Tank - VR32546HBLANK\u003c\/a\u003e — wide, low-profile option\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this tank compatible with my RV?\u003c\/strong\u003e\u003cbr\u003eThis tank measures 55-3\/4\" x 23-3\/4\" x 8\" and is designed as a direct-fit OEM replacement for many Class A, Class C, and fifth-wheel RVs. Always verify your bay dimensions before ordering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this as a black water or gray water tank?\u003c\/strong\u003e\u003cbr\u003eYes. The EPI 5523 \/ H879003 is suitable for both black water (toilet waste) and gray water (sink\/shower drain) applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I install a replacement RV holding tank?\u003c\/strong\u003e\u003cbr\u003eInstallation typically involves draining and removing the old tank, disconnecting fittings, and securing the new tank in the bay. We recommend consulting your RV's service manual or a certified RV technician for installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat fittings does this tank come with?\u003c\/strong\u003e\u003cbr\u003eThe tank includes a standard 3\" outlet. Additional fittings (inlet, vent, sensor ports) can be added per quote — contact us via AI Live Chat for a custom fitting quote.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhere can I buy an authentic Elkhart Plastics RV holding tank?\u003c\/strong\u003e\u003cbr\u003eElkhartRVParts.com is the only authorized online source for genuine Elkhart Plastics \/ Ameri-Kart tanks. Beware of unauthorized resellers offering counterfeit or substandard alternatives.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the weight capacity or pressure rating of this tank?\u003c\/strong\u003e\u003cbr\u003eThis tank is manufactured to OEM quality standards with 0.180\" HDPE walls. It is designed for standard RV waste system pressures. Contact us for specific load or pressure specifications.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Elkhart RV Parts?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eAuthorized dealer for Elkhart Plastics \/ Ameri-Kart — guaranteed authentic OEM parts\u003c\/li\u003e\n\u003cli\u003eShips direct from our warehouse — fast, reliable freight delivery\u003c\/li\u003e\n\u003cli\u003eExpert support via AI Live Chat — get fitment help before you buy\u003c\/li\u003e\n\u003cli\u003eHassle-free returns on uninstalled, undamaged items\u003c\/li\u003e\n\u003cli\u003eTrusted by RV owners, dealers, and service centers nationwide\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv style=\"background:#f3f4f6;border-left:4px solid #dc2626;padding:16px;margin-top:24px;\"\u003e\n\u003cstrong style=\"color:#dc2626;\"\u003eReady to order or need a custom fitting quote?\u003c\/strong\u003e\u003cbr\u003eUse our AI Live Chat to confirm fitment for your specific RV make, model, and year — and get a quote for any additional fittings or accessories you need.\n\u003c\/div\u003e","brand":"Elkhart Plastics\/Ameri-Kart","offers":[{"title":"Default Title","offer_id":41709155844248,"sku":"H879003\/5523","price":368.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/products\/EPI-holding-tanks-H879M.png?v=1678809845","url":"https:\/\/elkhartrvparts.com\/products\/elkhart-plastics-28-gallon-rv-holding-tank-55-3-4-x-23-3-4-x-8-5523-h879003","provider":"Elkhart RV Parts","version":"1.0","type":"link"}