13mm (1/2") 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 13mm 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: 13mm
Outside
Diameter: 21mm
W
13mm ID Silicone Manifold Cap Reinforced High Temp Coolant Air Vacuum Turbo
Description
This 13 mm inside diameter silicone manifold cap is designed to seal open hose ports in coolant, air, vacuum, and turbo systems. Molded from reinforced high-temperature silicone, it resists heat, pressure, oil vapor, and engine bay chemicals for long service life in performance and daily-driver environments.
Ideal for blocking unused fittings during engine builds, diagnostics, or permanent deletes, this cap provides a tight, leak-free seal on metal and plastic barbs. Commonly used in automotive, motorsports, and professional shop settings where reliability under heat and boost matters.
Includes one 13 mm silicone cap and one stainless worm-drive clamp for secure installation.
Specifications
Inside diameter: 13 mm (0.51")
Material: Reinforced silicone rubber
Color: Black
Temperature range: −40°F to 392°F (−40°C to 200°C)
Design: Closed-end hose cap
Function: Port sealing, vacuum block, coolant line cap
Use environment: Engine bay / high-temperature automotive
Key Uses
-
Vacuum line and manifold port blocking
-
Coolant hose deletes and reroutes
-
Turbo and boost reference sealing
-
Intake and emissions system cleanup
-
Diagnostic and test configurations
Common Applications
Automotive engines, turbo systems, intake manifolds, vacuum networks, coolant lines,
motorsports builds, performance shops, and professional repair bays.
Package Options
Single 13 mm cap with stainless clamp. Other sizes are available in separate listings.
Application & Fitment Disclaimer
This silicone cap is a universal aftermarket part intended for general automotive use. Vehicle
manufacturers use different hose materials, wall thicknesses, and barb styles. Always measure
your hose or fitting before ordering to confirm proper fit. Professional installation is
recommended for pressurized or high-temperature systems. This product is not manufactured,
endorsed, or affiliated with any vehicle or engine brand; all brand names are used only to
describe typical applications.
Service
Ships from California, USA warehouse
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99.8 percent positive feedback
10 percent discount on 2 or more packs
Free shipping with tracking included