{"product_id":"2pcs-high-temperature-4-ply-reinforced-silicone-hose-cap-id","title":"2Pcs High Temperature 4-Ply Reinforced Silicone Hose Cap ID","description":"\u003cp\u003e\u003cstrong\u003eTuoLauthon 2-pack reinforced silicone hose caps are high-temperature, 4-ply plugs designed to seal 5\/16\" (8mm) ports for turbo bypass valves, throttle-body water ports, heater cores and other coolant or vacuum lines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese compact silicone end caps combine thick-wall, polyester reinforcement with stainless clamps so you can temporarily cap or permanently seal small-diameter coolant and vacuum ports without cutting or welding. Each cap fits hoses with a 5\/16\" internal diameter, resists heat up to 350°F, and arrives as a set of two caps plus two rust-resistant clamps for an immediate install on cars, trucks, and motorsport plumbing.\u003c\/p\u003e\n\n\u003ch3\u003eWill these silicone caps withstand engine bay temperatures?\u003c\/h3\u003e\n\u003cp\u003eYes — the caps are built from 4-ply polyester-reinforced silicone formulated for elevated heat and pressure. The material maintains shape and sealing performance under typical engine cooling-system temperatures and brief higher peaks.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMaximum rated temperature: 350°F (177°C).\u003c\/li\u003e\n  \u003cli\u003e4-ply polyester reinforcement for stability under pressure.\u003c\/li\u003e\n  \u003cli\u003e5mm wall thickness reduces collapse or blow-off risk.\u003c\/li\u003e\n  \u003cli\u003eStainless steel clamps included for secure fastening.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat size ports and hoses do these plugs fit?\u003c\/h3\u003e\n\u003cp\u003eEach cap is sized for a 5\/16\" (8mm) internal diameter hose end; the outer diameter and overall lengths are optimized for common small coolant and vacuum ports. The dimensions make them suitable for many turbo bypass, heater bypass, and throttle-body water fittings.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInner diameter (ID): 5\/16\" (8mm).\u003c\/li\u003e\n  \u003cli\u003eOuter diameter (OD): 45\/64\" (approx. 18mm).\u003c\/li\u003e\n  \u003cli\u003eInside length: 4 cm; overall length: 4.5 cm for a snug fit.\u003c\/li\u003e\n  \u003cli\u003eWall thickness: 5 mm for durable sealing contact.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I install and secure the hose caps?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward: slide the cap over the hose or port and tighten the supplied stainless-steel clamp until the silicone compresses evenly. The clamp provides a reliable mechanical seal while the reinforced silicone offers flexibility to accommodate slight variations in port shape.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePush cap onto hose end or port opening until seated.\u003c\/li\u003e\n  \u003cli\u003ePosition stainless clamp over cap lip and tighten with a screwdriver or nut driver.\u003c\/li\u003e\n  \u003cli\u003eConfirm no visible gaps and that the clamp is snug but not over-tightened.\u003c\/li\u003e\n  \u003cli\u003eRe-check after a short test run for any loosening under heat cycles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre there any fluids or conditions to avoid with these plugs?\u003c\/h3\u003e\n\u003cp\u003eThese silicone caps are engineered for water, coolant, air and vacuum applications; they are not compatible with oil, gasoline, diesel or other petroleum-based fluids. Avoid prolonged exposure to aggressive chemicals and fuels that degrade silicone or the polyester reinforcement.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRecommended: coolant, water, compressed air, vacuum, turbo bypass ports.\u003c\/li\u003e\n  \u003cli\u003eNot compatible: oil, gasoline, diesel, and petroleum-derived fluids.\u003c\/li\u003e\n  \u003cli\u003eAvoid prolonged contact with harsh solvents or acids.\u003c\/li\u003e\n  \u003cli\u003eInspect periodically for wear if used in high-cycle or high-vibration environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? If you work on performance engines, repair heating and cooling systems, or need a reliable way to block small-diameter ports temporarily or permanently, these TuoLauthon silicone hose caps offer a low-cost, high-temperature sealing solution. They suit home mechanics, tuners, fleet maintenance techs, and DIYers who need an easy install with corrosion-resistant clamps and heavy-duty reinforcement. Note: choose different specialty plugs for petroleum-based fluids or larger hose diameters.\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: Can these caps handle coolant system pressure?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — 4-ply reinforcement and a 5mm wall withstand typical coolant pressures when clamped correctly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these plugs safe for use with engine oil or fuel?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No — these silicone caps are not compatible with oil, gasoline, diesel, or petroleum-based products.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"TuoLauthon","offers":[{"title":"Default Title","offer_id":48087401791646,"sku":"B0D98FP3TL","price":36.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/tuolauthon-front-packaging-silicone-hose-caps.jpg?v=1785923396","url":"https:\/\/northtrailauto.ca\/products\/2pcs-high-temperature-4-ply-reinforced-silicone-hose-cap-id","provider":"North Trail Auto","version":"1.0","type":"link"}