{"product_id":"dicmic-diesel-transfer-tank-vented-cap-2-inch-threaded-base-cast-iron-pressure-relief-vent","title":"DICMIC Diesel Transfer Tank Vented Cap 2-inch Threaded Base, Cast-Iron Pressure-Relief Vent","description":"\u003cp\u003e\u003cstrong\u003eThe DICMIC Transfer Tank Vented Cap is a 2-inch threaded, pressure-relief fuel cap that vents vapors and prevents vacuum collapse for diesel transfer and storage tanks.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eBuilt for rugged use on transfer tanks and auxiliary fuel containers, this venting cap assembly combines a removable vented cap with a heavy-duty cast-iron 2-inch threaded base. The design channels trapped pressure and allows air to enter as fuel is dispensed, reducing stress on tank walls and minimizing vapor build-up while resisting water and corrosion for long-term performance.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this cap control pressure and vapors in a diesel tank?\u003c\/h3\u003e\n\u003cp\u003eWhen the cap is loosened to the vent notch, internal tank pressure is released safely to the atmosphere, helping prevent over-expansion from trapped vapors. The vent also lets ambient air back into the tank as fuel is drawn out, avoiding negative pressure that can deform the container.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRemovable vented cap vents excess pressure when rotated to the notch.\u003c\/li\u003e\n  \u003cli\u003eVent path reduces dangerous vapor accumulation in enclosed tanks.\u003c\/li\u003e\n  \u003cli\u003eAllows controlled air intake to prevent vacuum formation during pumping.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and features make it durable?\u003c\/h3\u003e\n\u003cp\u003eThe cap assembly uses corrosion-resistant components and a waterproof construction to withstand outdoor exposure and contact with diesel and distillates. The cast-iron 2-inch base provides secure mounting and a stable threaded seal that holds up in farm, commercial, and mobile fuel applications.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWaterproof and corrosion-resistant materials for long service life.\u003c\/li\u003e\n  \u003cli\u003eHeavy-duty cast-iron 2\" threaded base for robust mounting.\u003c\/li\u003e\n  \u003cli\u003eRemovable top cap for easy cleaning or replacement if needed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs it simple to install and operate on existing tanks?\u003c\/h3\u003e\n\u003cp\u003eYes — the cap installs without special tools: align the vent cap with the base notch, push down, and twist clockwise until fully seated. To open, twist counter-clockwise to the notch to vent first, then push and lift to remove, making operation safe and straightforward for routine fueling tasks.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTool-free installation: align, press down, and twist to secure.\u003c\/li\u003e\n  \u003cli\u003eTwo-step removal (vent then lift) for controlled depressurization.\u003c\/li\u003e\n  \u003cli\u003eDesigned for retrofit to common 2\" threaded transfer and auxiliary tank openings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich tanks and applications is this cap compatible with?\u003c\/h3\u003e\n\u003cp\u003eThis vented cap is intended for transfer tanks, mobile fuel tanks, auxiliary and weather-protected tanks used in agricultural, commercial, and industrial settings. It fits many diesel, distillate, and fuel storage applications where a 2-inch threaded base is standard.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with transfer tanks, fuel tanks, auxiliary\/mobile fuel containers.\u003c\/li\u003e\n  \u003cli\u003eSuitable for farm equipment, service trucks, and on-site refueling systems.\u003c\/li\u003e\n  \u003cli\u003eWorks with tanks designed for diesel and similar distillate fuels.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The DICMIC Transfer Tank Vented Cap is aimed at fleet managers, farmers, contractors, and anyone who maintains mobile or stationary diesel storage and wants a durable, easy-to-use venting solution. It’s a practical upgrade for older tanks prone to vapor buildup or vacuum collapse and a reliable replacement part for routine maintenance.\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: Will this cap fit my tank?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It fits tanks with a standard 2-inch threaded opening; check your tank thread size before purchase.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How do I vent the tank safely?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Twist counter-clockwise to the notch to vent pressure, then push and lift the cap to remove.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"DICMIC","offers":[{"title":"Default Title","offer_id":48085608333470,"sku":"B0CR9ZBKKT","price":37.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/dicmic-front-view-threaded-cap.jpg?v=1785874052","url":"https:\/\/northtrailauto.ca\/products\/dicmic-diesel-transfer-tank-vented-cap-2-inch-threaded-base-cast-iron-pressure-relief-vent","provider":"North Trail Auto","version":"1.0","type":"link"}