Silicon block off caps

NZKW Australia Silicone Block Off Caps | Coolant & Air Hose Plugs

NZKW Australia Silicone Block Off Caps are designed for securely sealing air and coolant lines during maintenance, fabrication or system modification. Built from high-quality silicone, these caps provide a reliable, reusable sealing solution for automotive, motorsport and workshop applications.

Ideal for blocking off hoses during cooling system work, pressure testing or temporary system isolation, these caps offer excellent heat resistance and durability under demanding conditions.

Specifications

• Uses: Air or coolant systems
• Operating Temperature: -40°C to 220°C (428°F)
• Pressure Rating: 0.3 to 0.9 MPa
• Standard Colour: Black
• Size Tolerance: ±0.5mm

Why Buy This Product?

• Heat resistant silicone construction for demanding environments
• Suitable for coolant and air system block-offs
• Reusable and durable for workshop and motorsport use
• Helps during pressure testing and system diagnostics
• Flexible fitment with slight tolerance allowance
• Clean and simple solution for temporary or permanent sealing

Ideal For

• Cooling system maintenance
• Radiator and hose testing
• Turbo and intake system work
• Workshop and fabrication use
• Motorsport pit and garage setups
• General automotive repair and modification

NZKW Australia – Trusted Local Supply

NZKW Australia is proudly based on the Gold Coast and supplies high-quality silicone hose products, AN fittings and workshop consumables to automotive professionals and enthusiasts across Australia. We ship Australia-wide, ensuring reliable products for both performance and general workshop use.

Orders are dispatched within 24 hours, unless stated otherwise at time of ordering.

Online Only: 24 to 48 hours delay, but in some cases up to 5 days, depending on the product and third-party shipping.

Pre-order: Available only for items in transit to our Australian warehouse. Estimated dates depend on third-party shipping.

Special Order: Products we manufacture or need to restock. Average time is 3-5 weeks, but may vary depending on third- party shipping