1" ID Hi Performance Silicone Caps for Coolant, Water, Air, Vacuum, Emission, Water Ports, Turbos, and more.

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

High Performance 1" (25mm) 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: 1" (25mm) Outside Diameter: 1.330"

Rubber Tubing & Cordage

Quality products since 2014
  • Rubber Tubing
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  • Vacuum Hose
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  • Rubber Cord
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  • Grommets
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  • Tubing Plugs
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1" ID Silicone Manifold Caps for Coolant, Water, Vacuum, Air, Turbo Bypass
 

1" ID Hi Performance Silicone Caps for Coolant, Water, Air, Vacuum, Emission, Water Ports, Turbos, and more.

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

High Performance 1" (25mm) 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: 1" (25mm) Outside Diameter: 1.330"

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

Description
This reinforced silicone hose cap is designed for blocking off open hose ends in intake, coolant, and
vacuum systems. Built from high-temperature, multi-ply silicone, it withstands heat, pressure, and
vibration in automotive and industrial environments. Ideal for turbo builds, boost leak testing,
engine bay clean-up, and temporary line isolation during service or fabrication. The thick wall
construction resists collapse while maintaining a secure seal under clamp pressure.

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 cap + 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, test benches, shop diagnostics, 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: 1" 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

· All Rights Reserved to My Store · 
This reinforced silicone hose cap provides a reliable, heat-resistant solution for sealing open
intake, vacuum, and coolant lines in automotive and industrial systems. Its thick multi-ply design
maintains shape under clamp pressure while resisting collapse from heat and vibration. Commonly
used in turbo builds, boost leak testing, and engine bay service work, it allows technicians and
fabricators to quickly block unused ports and hoses with confidence. Ideal for performance shops,
garage builders, and MRO environments where durable, reusable hose sealing is required.