Silicone Blanking Caps - Various sizes

High quality BOOST Products silicone cap

This BOOST Products silicone t-piece coupler is polyester reinforced, rigorously tested for its strength and is your high quality solution for your silicone needs. All of our silicone products are tested for their pressure resistance and rigidity, giving you one less thing to worry about in your build. These are quite simple, but effective when you need to close off a system.

Key benefits and features

-40°C to 220°C operating temperature range

70±5 Shore A hardness rating

4 layer reinforced silicone

Sizes range from 10mm (0.375") to 38mm (1.5")

Polyester included in reinforcement layers

Aramid interior layer

BOOST product warranty

Embedded QR code for testing procedure and results

Not rated for constant fuel or oil contact!

What is the difference between silicone caps and rubber caps?

Silicone caps offer better resistance and longevity over rubber. Rubber is cheap and easy to manufacture, and in most cases caps constructed with rubber will work fine. But by choosing silicone over rubber, you are performing cheap maintanence and preventing wear-and-tear failures.

How do I choose the right size for me?

If you are unsure what size you need, measure the outer diameter of the pipe or connection and match it the best you can to our table below. Be aware of the inlet and outlet sizing you need. If the exact size is not available, the next smaller size may suffice depending on the elasticity and application. Give us a call if you are still unsure!

What sets BOOST silicone caps apart from the competition?

There are several factors that make our silicone truly unique. Every silicone hose or coupler that leaves our warehouse comes with an imprinted QR code that contains all of our rigorous testing protocols and burst pressures. You yourself can check and verify this information to ensure you are getting a silicone hose backed with the most thorough quality assurance standards on the market.

BOOST silicone also all come with a high Shore A hardness rating. Shore A hardness is a scale to determine the hardness of plastics and rubber, that scale goes from 0-100. Our silicone comes with a 70 (±5) Shore A hardness, which means it doesn't bend easily and retains much better shape under pressure or vacuum loads than the more commonly found 40 Shore A hardness in other silicone. So with our hardness rating, you can be sure you are getting proper function under boost or intake applications without deformation.

What type of clamps should I use on this cap?

These are simple blanking caps, so worm gear clamps would be ideal. They are not meant to hold high amounts of boost or pressure. Depending on the application, you could even use zip ties.

Some other things to consider...

Remember that the diameter always refers to the inner diameter, so be sure to consider that when choosing the size for you.

An easy way to figure out the right clamp size, multply the hose wall thickness by 2. That will give you the right size!

If you are having trouble finding the exact size, the next smaller size is usually enough to suffice.

BOOST not only delivers extremely high quality at a competitive price, but we have the testing to back our claims - and we can prove it. The BOOST products silicone products have achieved and many times even exceeded the quality of those compared to the ones made by well known manufacturers. This silicone is durable and proven to last through hard use. Many rely on the silicone made by BOOST products, so we have you covered for any level of build!