UrMarketOutlet HPS RSCC-062-BLK 5/8inch Black Silicone Coolant Cap+Clamp(coolant/water/air.turbo bypass valve/vacuum/throttle body water port/heater core/fixleak)

My car came with a non-reinforcements cap. Always concerned me but no worries now

Exactly as described. These hps caps are high quality and worth every penny!. Will definitely buy more in the future.

Used this to replace leaking rubber cap on 1990 VW Jetta. This one should last a long time.

I’m using two of these to block off the output on the water pump that feeds the heater core under the pressure that’s produced by the water pump and the heat I can say it’s holding up great no leaks and no issues no cracking from drying out so I can say if you using these to cap off I can definitely recommend this item