HPS 5/16" (8mm) Black High Temperature 3-ply Reinforced Silicone Coolant Cap Bypass Heater, 1-1/2" Length, 350F Max. Temp, 4mm Wall Thickness

I purchased three of these bypass valve stoppers for my 2006 Ford Focus, which has a couple extra bypass tubes for the radiator. After blowing thru two manufacturer caps I found this company. These products will literally last longer than my radiator and car itself. Not only was the cap almost impossible to find, with the exception of this company, it is quality freaking stuff. The radiator will literally explode out of its aluminum before this cap fails. Great product and if you’re worried about the price, then just keep buying those cheap vacuum caps and you’ll eventually spend the same amount and some.

I don’t need a heater in Hawaii and this size cap is a perfect fit for my 2000 Sienna van, inlet and outlet, since not even the dealership has replacement hoses.

It good

Holds up to high heat