{"product_id":"hemrunk-vented-transfer-tank-fuel-cap-2-npt-thread-diesel-tank-cap-spring-loaded-venting","title":"HEMRUNK Vented Transfer Tank Fuel Cap 2\" NPT Thread - Diesel Tank Cap, Spring-Loaded Venting","description":"\u003cp\u003e\u003cstrong\u003eHEMRUNK’s vented transfer tank cap is a direct-fit replacement diesel fuel cap with a 2\" NPT threaded neck that vents tank pressure and prevents vacuum build-up.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis heavy-duty replacement cap is designed for transfer tanks, mobile fuel tanks and auxiliary diesel tanks that require a venting solution and a secure seal. It replaces common Fill-Rite\/Dee Zee style caps, fits a 2\" NPT threaded neck and combines a snug iron base with internal springs and seals so fluids stay contained while air can move freely in and out of the tank.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the HEMRUNK cap prevent over-pressurization or vacuum?\u003c\/h3\u003e\n\n\u003cp\u003eThe built-in vent mechanism allows excess pressure to escape and permits air to enter as fuel is used, keeping tank pressure near atmospheric levels. This reduces stress on the tank body and plumbing and helps ensure consistent fuel flow to pumps or engines.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIntegrated venting releases pressure safely while in storage or transit.\u003c\/li\u003e\n  \u003cli\u003eAir intake prevents vacuum that can hinder fuel delivery.\u003c\/li\u003e\n  \u003cli\u003eSpring-actuated valve opens at set pressure differentials for reliable function.\u003c\/li\u003e\n  \u003cli\u003eDesigned to work with diesel and similar fuels without altering system operation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this cap fit my existing 2\" NPT transfer tank neck?\u003c\/h3\u003e\n\n\u003cp\u003eThe HEMRUNK cap installs on a standard 2\" NPT threaded neck and is intended as a replacement for many Fill-Rite and Dee Zee transfer tank caps. It includes an iron threaded base that seats into the tank neck for a secure mechanical fit.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e2\" NPT threads match common transfer tank plugs and adapters.\u003c\/li\u003e\n  \u003cli\u003eIron base provides a durable, tight fit to resist loosening under vibration.\u003c\/li\u003e\n  \u003cli\u003eWorks with most diesel and fuel-compatible tank openings designed for 2\" NPT caps.\u003c\/li\u003e\n  \u003cli\u003eCheck thread type and diameter on your tank before ordering to confirm compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow simple is installation and removal for everyday use?\u003c\/h3\u003e\n\n\u003cp\u003eInstallation is straightforward: align the cover with the groove, press down and rotate clockwise until seated. Removing the cap requires pushing down and turning counterclockwise, so routine fuel access is quick and tool-free for most users.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eTool-free twist-and-lock operation for fast maintenance and refills.\u003c\/li\u003e\n  \u003cli\u003ePositive alignment groove minimizes cross-threading during installation.\u003c\/li\u003e\n  \u003cli\u003eCompression design with internal seals ensures leak resistance after each use.\u003c\/li\u003e\n  \u003cli\u003eSturdy construction resists wear from repeated removal and replacement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat keeps the cap leak-proof while still venting?\u003c\/h3\u003e\n\n\u003cp\u003eHEMRUNK combines a snug-fitting iron neck with spring-loaded seals inside the cap that close against liquid while allowing gas to pass through the vent when needed. This arrangement limits fuel seepage but still equalizes pressure as the tank fills or empties.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eSpring-loaded valve seals against liquid intrusion yet opens for gas exchange.\u003c\/li\u003e\n  \u003cli\u003eRubber or elastomer seals resist fuel degradation and maintain a tight closure.\u003c\/li\u003e\n  \u003cli\u003eIron base provides structural rigidity for consistent sealing over time.\u003c\/li\u003e\n  \u003cli\u003eEngineered to reduce drips and leaks under normal operating conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: The HEMRUNK vented transfer tank cap is aimed at fleet managers, contractors, farmers and vehicle owners who use portable diesel tanks, auxiliary fuel systems or weather guard-style mobile tanks. If you need a dependable, replaceable 2\" NPT vented cap that balances secure containment with reliable venting, this cap offers a robust, easy-to-use solution for routine fueling and transport needs.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this cap compatible with Fill-Rite or Dee Zee transfer tanks?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — it's designed to replace many Fill-Rite\/Dee Zee style caps that use a 2\" NPT threaded neck, but confirm your tank thread type first.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the venting feature cause fuel leaks?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No — internal springs and seals prevent liquid leakage while the vent allows air and pressure relief.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"HEMRUNK","offers":[{"title":"Default Title","offer_id":48084969029790,"sku":"B0DRBFRBJN","price":37.23,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/hemrunk-front-view-cap-installed.jpg?v=1785866196","url":"https:\/\/northtrailauto.ca\/products\/hemrunk-vented-transfer-tank-fuel-cap-2-npt-thread-diesel-tank-cap-spring-loaded-venting","provider":"North Trail Auto","version":"1.0","type":"link"}