{"product_id":"horst-miracle-probe-black-water-tank-sensor-500674","title":"Elkhart Plastics - Horst Miracle Probe for RV Black Water Tanks - 500674 - 2.4375\" Length - Single Probe","description":"\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #1d9bf0; padding: 16px; margin-bottom: 20px;\"\u003e\n\u003cp style=\"margin: 0; color: #1d9bf0; font-weight: bold;\"\u003e✓ \u003cstrong\u003eElkhartRVParts.com - The Only Authorized Place for Elkhart Plastics\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #10b981; padding: 16px; margin-bottom: 20px;\"\u003e\n\u003cp style=\"margin: 0; color: #10b981; font-weight: bold;\"\u003e✓ \u003cstrong\u003e100% Verified Authentic OEM Grade Part\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eIf you're tired of inaccurate black water tank readings caused by waste buildup and toilet paper residue, the \u003cstrong\u003eHorst Miracle Probe 500674\u003c\/strong\u003e is your solution. This precision-engineered RV black tank sensor eliminates false readings and delivers reliable monitoring every time, giving you confidence in your holding tank levels on every trip.\u003c\/p\u003e\n\n\u003ch2\u003eFeatures \u0026amp; Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShielded Brass Tips:\u003c\/strong\u003e Prevents waste buildup interference for accurate readings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTeflon Insulators:\u003c\/strong\u003e Long-lasting durability and electrical isolation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Fit:\u003c\/strong\u003e Designed for standard 3\/8\" screw-in sensor holes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlack Water Optimized:\u003c\/strong\u003e Specifically engineered for RV waste holding tanks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.4375\" Probe Length:\u003c\/strong\u003e Ideal depth for most RV black tank applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM-Grade Quality:\u003c\/strong\u003e Made by Horst Engineering (Elkhart Plastics) - trusted RV sanitation experts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy DIY Installation:\u003c\/strong\u003e No tank removal or special tools required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose the Horst Miracle Probe for Black Water Tanks?\u003c\/h2\u003e\n\u003cp\u003eStandard factory tank sensors fail because they're exposed to waste, toilet paper, and residue that creates false electrical contact. The \u003cstrong\u003eHorst Miracle Probe\u003c\/strong\u003e solves this with a revolutionary shielded design that keeps the brass sensing tip clean and accurate. You'll get real-time, precise black tank level monitoring without the guesswork. Whether you're a weekend warrior or full-time RVer, this black water tank sensor ensures you never overfill or misjudge your holding tank capacity again.\u003c\/p\u003e\n\n\u003ch2\u003eCompare RV Tank Sensors \u0026amp; Monitoring Solutions\u003c\/h2\u003e\n\u003cp\u003eNot sure which tank sensor or monitoring system is right for your RV? Compare the Horst Miracle Probe with other popular options to find the best fit for your black, gray, or fresh water tanks.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x: auto; margin: 20px 0;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #e5e7eb;\"\u003e\n\u003cthead\u003e\n\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;\"\u003eTank Type\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eQuantity\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eProbe Length\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\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #fef2f2; border-left: 3px solid #dc2626;\"\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eHorst Miracle Probe 500674\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eBlack Water\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e1 Probe\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e2.4375\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eIndividual black tank sensor replacement\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;\"\u003e\u003cstrong\u003eMini Probes 500674M\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eFresh \u0026amp; Gray Water\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e6 Pack\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e1\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eBulk replacement for fresh\/gray tanks\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/elkhart-mini-probes-rv-water-tanks-500674m-pack-6\" style=\"color: #dc2626; font-weight: bold;\"\u003eView Product\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eKIB Wall Panel Monitor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eAll Tanks\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eMonitor Only\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eN\/A\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eComplete monitoring system for up to 3 tanks\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/kib-tank-level-sensor-wall-panel-monitor-for-up-to-3-rv-holding-tanks\" style=\"color: #dc2626; font-weight: bold;\"\u003eView Product\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eUniversal Holding Tank Kit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eBlack \u0026amp; Gray Water\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e4 Sensors + Fittings\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eVaries\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eComplete DIY installation kit with couplers\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/rv-holding-tank-fittings-kit-sensors-black-grey-water\" style=\"color: #dc2626; font-weight: bold;\"\u003eView Product\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cp style=\"background-color: #f3f4f6; border-left: 4px solid #1d9bf0; padding: 16px; margin-top: 20px;\"\u003e\u003cstrong\u003e💡 Pro Tip:\u003c\/strong\u003e Most RV black tanks use 3-4 sensor probes to indicate empty, 1\/3, 2\/3, and full levels. Check how many sensor ports your tank has before ordering.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 500674\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 5019\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Horst Engineering (Elkhart Plastics)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProbe Length:\u003c\/strong\u003e 2.4375\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Diameter:\u003c\/strong\u003e 0.375\" (3\/8\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Brass tips with Teflon insulators\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank Compatibility:\u003c\/strong\u003e RV black water holding tanks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Resistance-based (OEM-style)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Screw-in replacement for existing sensor holes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.5 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Canada (Quebec)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1x Horst Miracle Probe for Black Water Tanks (500674)\u003c\/li\u003e\n\u003cli\u003eManufacturer's quality guarantee\u003c\/li\u003e\n\u003cli\u003eCompatible with standard OEM resistance-based tank monitoring systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible Models \u0026amp; Alternatives\u003c\/h2\u003e\n\u003cp\u003eThe Horst Miracle Probe 500674 is designed for RV black water tanks with standard 3\/8\" sensor ports. If you need sensors for fresh or gray water tanks, check out the \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/elkhart-mini-probes-rv-water-tanks-500674m-pack-6\" style=\"color: #dc2626; font-weight: bold;\"\u003eElkhart Mini Probes 500674M 6-Pack\u003c\/a\u003e. For a complete holding tank upgrade, explore our \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/rv-holding-tank-fittings-kit-sensors-black-grey-water\" style=\"color: #dc2626; font-weight: bold;\"\u003eUniversal Holding Tank Fittings Kit\u003c\/a\u003e with sensors and couplers.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3\u003eHow do I install the Horst Miracle Probe in my RV black tank?\u003c\/h3\u003e\n\u003cp\u003eInstallation is simple: locate the existing sensor on your black water tank, unscrew the old probe, and screw in the Horst Miracle Probe 500674. No tank removal, no special tools, and no plumbing modifications required. The 3\/8\" threaded design fits standard RV tank sensor ports.\u003c\/p\u003e\n\n\u003ch3\u003eIs this probe compatible with SeeLevel or ultrasonic tank monitors?\u003c\/h3\u003e\n\u003cp\u003eNo, the Horst Miracle Probe 500674 is designed for standard OEM-style resistance-based tank monitoring systems. It is not compatible with ultrasonic sensors like SeeLevel or external monitoring systems.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's the difference between black water probes and fresh\/gray water probes?\u003c\/h3\u003e\n\u003cp\u003eBlack water probes like the Horst Miracle Probe 500674 feature shielded brass tips specifically designed to resist waste buildup and toilet paper interference. Fresh and gray water probes (like the 500674M Mini Probes) are shorter and optimized for cleaner water applications.\u003c\/p\u003e\n\n\u003ch3\u003eHow many Horst Miracle Probes do I need for one black tank?\u003c\/h3\u003e\n\u003cp\u003eMost RV black tanks use 3-4 sensor probes to indicate empty, 1\/3 full, 2\/3 full, and full levels. Check your tank's sensor port configuration to determine how many probes you need.\u003c\/p\u003e\n\n\u003ch3\u003eCan I use this probe in my gray water or fresh water tank?\u003c\/h3\u003e\n\u003cp\u003eWhile the Horst Miracle Probe 500674 will physically fit, it's specifically engineered for black water tanks. For fresh and gray water applications, we recommend the \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/elkhart-mini-probes-rv-water-tanks-500674m-pack-6\" style=\"color: #dc2626; font-weight: bold;\"\u003eElkhart Mini Probes 500674M\u003c\/a\u003e which are optimized for those tank types.\u003c\/p\u003e\n\n\u003ch3\u003eWhy are my RV tank sensors giving false readings?\u003c\/h3\u003e\n\u003cp\u003eFalse readings are typically caused by waste buildup, toilet paper, or residue creating electrical contact on exposed sensor tips. The Horst Miracle Probe's shielded design prevents this interference, ensuring accurate black tank level monitoring.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Elkhart RV Parts?\u003c\/h2\u003e\n\u003cp\u003eElkhart RV Parts is the authorized distributor for Elkhart Plastics and Horst Engineering products. Every Horst Miracle Probe we sell is 100% authentic, OEM-grade quality backed by manufacturer warranties. We specialize in RV holding tank components, plumbing fittings, and sanitation systems with expert support and fast shipping. Our commitment to quality means you get the right part, the first time, with confidence.\u003c\/p\u003e\n\n\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #dc2626; padding: 16px; margin-top: 30px;\"\u003e\n\u003cp style=\"margin: 0; font-weight: bold; color: #dc2626;\"\u003e🚀 Ready to eliminate false black tank readings? Add the Horst Miracle Probe 500674 to your cart now! Questions? Our AI Live Chat is here to help you find the perfect tank sensor solution.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Elkhart Plastics\/Ameri-Kart","offers":[{"title":"Default Title","offer_id":41646806139032,"sku":"5019","price":8.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/2B5DA90F-B6A1-406C-BA93-D5989FB2F990.png?v=1750437205","url":"https:\/\/elkhartrvparts.com\/products\/horst-miracle-probe-black-water-tank-sensor-500674","provider":"Elkhart RV Parts","version":"1.0","type":"link"}