{"product_id":"elkhart-plastics-42-gallon-rv-holding-tank-66-x-21-x-9-366h-h1253","title":"Elkhart Plastics - 42 Gallon RV Holding Tank 66\" x 21\" x 9\" EPI 366H\/H1253","description":"\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #1d9bf0; padding: 15px; margin-bottom: 15px;\"\u003e\u003cstrong style=\"color: #1d9bf0;\"\u003e✓ ElkhartRVParts.com - The Only Authorized Place for Elkhart Plastics\u003c\/strong\u003e\u003c\/div\u003e\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #10b981; padding: 15px; margin-bottom: 20px;\"\u003e\u003cstrong style=\"color: #10b981;\"\u003e✓ 100% Verified Authentic OEM Grade Part\u003c\/strong\u003e\u003c\/div\u003e\u003ch2\u003eElkhart Plastics 42 Gallon RV Holding Tank - Premium Roto-Molded Construction\u003c\/h2\u003e\u003cp\u003eThe Elkhart Plastics 42-gallon RV holding tank (Model 366H\/H1253) delivers the durability and reliability you need for your RV waste management system. Measuring 66\" x 21\" x 9\", this blank tank is engineered with precision roto-molding technology to provide seamless, leak-proof performance for years of trouble-free service.\u003c\/p\u003e\u003ch2\u003eWhy Choose This Elkhart Plastics Holding Tank\u003c\/h2\u003e\u003cp\u003eElkhart Plastics has earned its reputation as the industry leader in RV tank manufacturing through decades of innovation and quality control. This 42-gallon holding tank represents the pinnacle of their engineering expertise, featuring uniform 0.180\" wall thickness throughout the entire tank body. Unlike cheaper alternatives with thin spots and weak seams, this roto-molded design ensures consistent strength in every square inch, so you can travel with confidence knowing your waste system won't fail when you need it most.\u003c\/p\u003e\u003cp\u003eThe high-density polyethylene construction meets all health and safety standards while providing exceptional impact resistance. Whether you're navigating rough terrain or dealing with extreme temperature swings, this tank maintains its structural integrity without cracking, warping, or developing leaks. The seamless construction eliminates the weak points found in welded or multi-piece tanks, giving you peace of mind on every journey.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacity:\u003c\/strong\u003e 42 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 66\" L x 21\" W x 9\" H\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Numbers:\u003c\/strong\u003e 366H, H1253\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness:\u003c\/strong\u003e 0.180\" (uniform throughout)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e High-density polyethylene (HDPE)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturing Process:\u003c\/strong\u003e Roto-molded seamless construction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Blank tank (no pre-installed fittings)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 27 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarcode:\u003c\/strong\u003e 07786136\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCustom Fitting Installation\u003c\/h2\u003e\u003cp\u003eThis blank tank arrives without pre-installed fittings, giving you complete flexibility to configure your waste system exactly how you need it. Whether you're replacing an existing tank or building a custom RV setup, you can position drain valves, vent pipes, and inlet fittings precisely where your application requires. This customization capability makes it ideal for RV manufacturers, repair shops, and DIY enthusiasts who need a tank that fits their specific layout requirements.\u003c\/p\u003e\u003cp\u003eFittings can be professionally installed based on your specifications - contact us for a custom quote on fitting installation to ensure your tank is configured perfectly for your RV model and waste system design.\u003c\/p\u003e\u003ch2\u003eApplications and Compatibility\u003c\/h2\u003e\u003cp\u003eThis 42-gallon holding tank is perfectly sized for mid-size to large travel trailers, fifth wheels, and motorhomes. The 66\" length and 9\" height profile allows it to fit in tight underbelly spaces while still providing substantial waste capacity for extended trips. Common applications include:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eTravel trailer and fifth wheel replacements\u003c\/li\u003e\n\u003cli\u003eMotorhome waste system upgrades\u003c\/li\u003e\n\u003cli\u003eCustom RV builds and conversions\u003c\/li\u003e\n\u003cli\u003eRV repair and restoration projects\u003c\/li\u003e\n\u003cli\u003eFleet maintenance and OEM installations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompare Similar Holding Tanks\u003c\/h2\u003e\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 20px 0; overflow-x: auto; display: block;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background-color: #dc2626; color: white;\"\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eCapacity\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eDimensions (L×W×H)\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003ePart Number\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eBest For\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eView Details\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #fef2f2; border-left: 4px solid #dc2626;\"\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eElkhart 366H\/H1253\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e42 Gallons\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e66\" × 21\" × 9\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e366H, H1253\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eMid-size trailers, custom builds\u003c\/td\u003e\n\u003ctd style=\"padding: 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: 12px; border: 1px solid #e5e7eb;\"\u003eICON H4141\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e40 Gallons\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e59\" × 28\" × 8\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eH4141\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eWider profile applications\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/icon-holding-tank-h4141-59x28x8-40-gallons\" style=\"color: #dc2626;\"\u003eView Details\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eICON H3882\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e44 Gallons\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e59\" × 28\" × 8.25\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eH3882\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eSlightly larger capacity\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/icon-holding-tank-h3882-59x28x825-44-gallons\" style=\"color: #dc2626;\"\u003eView Details\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eJayco 602006000\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e37.5 Gallons\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eJayco-specific\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e602006000\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eJayco OEM replacement\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/rv-tanks37-5-gallon-jayco-holding-tank-602006000\" style=\"color: #dc2626;\"\u003eView Details\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eICON H3977\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e29 Gallons\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e52\" × 22\" × 8.25\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eH3977\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eCompact installations\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/icon-holding-tank-h3977-52x22x8-25-29-gallons\" style=\"color: #dc2626;\"\u003eView Details\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp style=\"background-color: #f3f4f6; padding: 12px; border-left: 4px solid #dc2626; margin-top: 10px;\"\u003e\u003cstrong\u003e💡 Helpful Tip:\u003c\/strong\u003e When selecting a holding tank, measure your available space carefully and consider both capacity needs and dimensional constraints. Blank tanks offer maximum installation flexibility for custom applications.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eWhat fittings do I need for this holding tank?\u003c\/h3\u003e\u003cp\u003eFitting requirements vary based on your specific RV configuration. Most installations require a drain valve fitting (typically 3\" termination), a vent pipe fitting, and an inlet fitting from your toilet. For assistance with fitting selection and custom installation quotes, use our AI Live Chat for expert product guidance.\u003c\/p\u003e\u003ch3\u003eHow do I install fittings on a blank holding tank?\u003c\/h3\u003e\u003cp\u003eProfessional installation is recommended to ensure proper sealing and prevent leaks. Fittings are typically installed using specialized hole saws and tank fitting flanges with gaskets. If you need fittings installed, contact us for a custom quote - we can configure your tank exactly to your specifications before shipping.\u003c\/p\u003e\u003ch3\u003eWill this tank fit my RV model?\u003c\/h3\u003e\u003cp\u003eWith dimensions of 66\" × 21\" × 9\", this tank fits most mid-size to large RVs with adequate underbelly clearance. Measure your existing tank or available space carefully, accounting for fitting protrusions and mounting hardware. For help determining compatibility, use our AI Live Chat for personalized assistance.\u003c\/p\u003e\u003ch3\u003eWhat makes Elkhart Plastics tanks better than other brands?\u003c\/h3\u003e\u003cp\u003eElkhart Plastics uses a precision roto-molding process that creates seamless tanks with uniform wall thickness throughout. This eliminates weak spots, prevents premature failure, and ensures consistent quality. Their tanks meet all health and safety standards and are manufactured with fewer impurities for superior strength and longevity.\u003c\/p\u003e\u003ch3\u003eCan I use this tank for fresh water instead of waste?\u003c\/h3\u003e\u003cp\u003eWhile this tank is designed and marketed as a holding tank for waste water, Elkhart Plastics manufactures their tanks to meet health and safety standards. However, we recommend using tanks specifically designated for fresh water applications to ensure optimal water quality and safety.\u003c\/p\u003e\u003ch2\u003eThe Elkhart Plastics Difference\u003c\/h2\u003e\u003cp\u003eWhen you choose an Elkhart Plastics tank, you're investing in over 50 years of manufacturing excellence. Their roto-molding process creates tanks that are stronger, more durable, and more reliable than conventional manufacturing methods. The seamless construction means no weak seams to split, no thin spots to crack, and no compromises in quality.\u003c\/p\u003e\u003cp\u003eEvery tank undergoes rigorous quality control to ensure it meets Elkhart Plastics' exacting standards. The result is a holding tank that can withstand the demanding conditions of RV life - from rough roads to temperature extremes - while maintaining leak-proof performance year after year.\u003c\/p\u003e\u003ch2\u003eOrder Your Elkhart Plastics Holding Tank Today\u003c\/h2\u003e\u003cp\u003eUpgrade your RV waste system with the industry's most trusted holding tank manufacturer. This 42-gallon blank tank gives you the flexibility to create a custom installation while delivering the proven reliability that has made Elkhart Plastics the preferred choice of RV manufacturers and repair professionals nationwide.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNeed help with fitting selection or custom configuration?\u003c\/strong\u003e Use our AI Live Chat for expert product knowledge and personalized assistance with your holding tank installation.\u003c\/p\u003e","brand":"Elkhart Plastics\/Ameri-Kart","offers":[{"title":"Default Title","offer_id":42533007786136,"sku":"366H\/H1253002","price":299.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/products\/366Htank.jpg?v=1768249152","url":"https:\/\/elkhartrvparts.com\/en-ca\/products\/elkhart-plastics-42-gallon-rv-holding-tank-66-x-21-x-9-366h-h1253","provider":"Elkhart RV Parts","version":"1.0","type":"link"}