Got a leak or need to cap off a coolant or vacuum port?

This HPS Performance 3/8\ black reinforced silicone cap comes with a clamp and is ready to install.

It’s brand new, still in its original packaging, and built from tough 3-ply polyester-reinforced silicone.

Handles extreme temps from -65°F all the way up to 350°F, so it’s good for pretty much any under-hood situation.

Inside diameter is 3/8\, outside is 0.69\, and it’s about 1.5 inches long.

This is a universal fit, so it’ll work for front, rear, left, or right coolant applications—just not for fuel or oil.

Pro install recommended if you’re not sure, but it’s straightforward enough for DIYers.

Also comes with a Prop 65 warning for California folks.