5/8" ID Hi Performance Silicone Caps for Coolant, Water, Air, Vacuum, Emission, Water Ports, Turbos, and more

Reinforced 3-Ply Silicone Bypass Cap with black stainless clamp, Throttle Body, Water Ports, Heater Cores
Packed 1 clamp + 1 black SS clamp per package

High Performance 5/8" (16mm) Reinforced Silicone Coolant Cap - High Temp – Black/Green Enhance your vehicle's cooling system with these high-performance high temperature reinforced black silicone caps. Engineered to handle high temperatures and pressures, this 3-ply polyester reinforced cap provides unmatched durability compared to traditional rubber coolant caps that may crack and leak over time. Specifications: Product Type: 3-ply Polyester Reinforced Silicone Coolant Cap Inside Diameter: 5/8" Outs

Rubber Tubing & Cordage

Quality products since 2014
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5/8" ID Silicone Manifold Caps for Coolant, Water, Vacuum, Air, Turbo Bypass
 

5/8" ID Hi Performance Silicone Caps for Coolant, Water, Air, Vacuum, Emission, Water Ports, Turbos, and more

Reinforced 3-Ply Silicone Bypass Cap with black stainless clamp, Throttle Body, Water Ports, Heater Cores
Packed 1 clamp + 1 black SS clamp per package

High Performance 5/8" (16mm) Reinforced Silicone Coolant Cap - High Temp – Black/Green Enhance your vehicle's cooling system with these high-performance high temperature reinforced black silicone caps. Engineered to handle high temperatures and pressures, this 3-ply polyester reinforced cap provides unmatched durability compared to traditional rubber coolant caps that may crack and leak over time. Specifications: Product Type: 3-ply Polyester Reinforced Silicone Coolant Cap Inside Diameter: 5/8" Outs

1" ID Reinforced Silicone Hose Cap Plug High Temp Intake Turbo Vacuum MRO

Description
This reinforced silicone hose cap is engineered for professional-grade sealing of open hose ends in
intake, coolant, and vacuum systems. Manufactured from multi-ply high-temperature silicone, it
handles heat, pressure, and vibration in automotive, powersports, and industrial environments.
Ideal for turbo builds, boost leak testing, engine bay cleanup, and temporary line isolation during
service or fabrication. The thick wall construction resists collapse while maintaining a secure,
leak-free seal under clamp pressure.

Each pack includes one (1) silicone cap and one (1) stainless hose clamp for immediate use.

Compliance Notice
This silicone hose cap is intended for off-road, racing, diagnostic, and service use only. It is not
designed or marketed to disable, bypass, or permanently alter any factory emissions control system.
Buyer is responsible for ensuring proper and lawful use in accordance with all local, state, and
federal emissions regulations.

Specifications
Inside diameter: 1" (25 mm)
Material: Reinforced high-temp silicone rubber
Color: Black exterior with green inner liner
Temperature rating: −40°F to 392°F (−40°C to 200°C)
Design: Straight hose cap / block-off plug
Use: Intake, vacuum, coolant, turbo plumbing
Compatibility: Automotive, powersports, industrial hose systems
Pack quantity: 1 silicone cap + 1 stainless clamp

Key Uses
• Turbo and intake system block-off
• Boost leak testing setups
• Vacuum line isolation
• Coolant hose sealing during service
• Engine bay cleanup and fabrication

Common Applications
Automotive performance builds, turbocharged engines, intercooler plumbing, engine swaps,
shop diagnostics, fleet service bays, and MRO hose management.

Service
Ships from California, USA warehouse
99.9 percent positive feedback
51,000 buyers' reviews
10 percent discount on 2 or more packs
Free shipping with tracking included

Product Specs
Brand: ATI
Type: Coolant Cap
Warranty: Unspecified Length
Unit Type: Unit
Size: 5/8" ID
Color: Black/Green
Manufacturer Part Number: NA
Surface Finish: Smooth
Country/Region of Manufacture: Unknown
Unit Quantity: 1
Placement on Vehicle: Front
Performance Part: Yes

4mm (1/8") Black Nitrile Solid Cord for Jewelry Making Oil Resistant Nitrile

$10.95

1" ID Silicone Manifold Caps for Coolant, Water, Vacuum, Air, Turbo Bypass

$16.5

7mm (1/4") Black Nitrile Solid Cord for Jewelry Making Oil Resistant Nitrile

$14.5

3/16" to 5/32" ID x 3/8" OD Black Nitrile Vacuum Tubing 12 Feet per package

$14.95

Silicone Caps 1/2" ID x 1 1/2" Length Hi Temp Vacuum Caps Masking Caps

$12.91

3MM (1/8") ID x 7mm OD Blue Silicone Air Vacuum Hose Tubing 12 feet per package

$17.91

3/16" to 5/32" Silicone Vacuum Caps Masking Caps Tubing Caps 15 per Package

$9.91

1/8" ID x 1/4" OD 12 Feet Nitrile Vacuum Tubing Premium Grade Oil Resistant NBR

$12.79

1/4" ID Hi Temp Silicone Vacuum Caps Masking Anodizing Various Package Sizes

$13.95

1/4" ID x 3/8" OD Black Nitrile Vacuum Tubing 12 Feet per package

$17.5

5/8" ID Hi Performance Silicone Caps for Coolant, Water, Air, Vacuum, Emissions

$14.5

3/16" to 5/32" Silicone Vacuum Caps Masking Caps Tubing Caps 25 per Package

$12.95
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We hope you will love your purchase, however if you need to return it, we have a 60 day return policy.

We hope you will love your purchase, however if you need to return it, we have a 60 day return policy.

We hope you will love your purchase, however if you need to return it, we have a 60 day return policy.

We hope you will love your purchase, however if you need to return it, we have a 60 day return policy.

We hope you will love your purchase, however if you need to return it, we have a 60 day return policy.

We hope you will love your purchase, however if you need to return it, we have a 60 day return policy.

Featured Products

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This reinforced silicone hose cap with included clamp delivers a durable, heat-resistant solution
for sealing intake, vacuum, and coolant lines in automotive and industrial systems. Its multi-ply
construction maintains shape under clamp pressure while resisting collapse from heat and vibration.
Commonly used for turbo builds, boost leak testing, and engine service work, it allows technicians
and fabricators to block unused hoses quickly and securely. Ideal for performance shops, fleet
maintenance, and MRO environments where reliable, reusable hose sealing is required.