ID 5/8" 16mm Silicone Vacuum Caps for Hose,4-Layer Coolant Bypass Cap/Clamp

ID 5/8" 16mm Silicone Vacuum Caps for Hose,4-Layer Coolant Bypass Cap/Clamp

• Key Dimensions: With a 16 mm (5/8 inch) inner diameter, this silicone hose cap features a 5 mm wall and 1.63 inch length. When blocking heater core outlets or intake cooling passages, the compact form avoids interference with adjacent wiring or hoses for a tidy bay
• 4-Layer Build: The 4-layer fabric-reinforced silicone structure structure resists tearing under clamp pressure while staying pliable. This lets the hose caps micro-adjust with movement while maintaining surface contact against interfaces, suiting water jacket outlets and vacuum ports mounted on the block
• Durable & Heat-Resistant: Seal integrity holds from -40°F to 356°F through winter cold starts and summer idles without hardening. These silicone vacuum caps retain softness for throttle ports affected by seasonal temperature shifts
• Matched Clamp Kit: Your package contains 1 silicone cap and 1 stainless steel clamp with diameters precisely aligned with the coolant bypass cap outer dimension. When tightened over the cap, compression distributes evenly to limit single-point seepage under vibration
• Compatibility Info: Rated for coolant, water, and air circuits but not for fuel or oil. These vacuum line caps offer weekend hobbyists and full-time techs a solid physical barrier for heater core bypasses during system modifications