3/4" Brass Blanking Cap

3/4" Brass Blanking Cap

The 3/4" Brass Blanking Cap is a heavy-duty threaded fitting designed to provide a secure, watertight seal for 3/4" BSP (British Standard Pipe) male threaded outlets. This cap is a standard component for decommissioning unused pipework, sealing off manifold ports, or capping secondary valves during system maintenance.

Manufactured from high-quality brass, it offers excellent resistance to corrosion and high temperatures, making it suitable for both domestic hot and cold water systems as well as central heating circuits.

Key Features and Specifications

Thread Size: 3/4" BSP Internal (Female) thread.

Material: Solid brass, providing superior durability compared to plastic alternatives.

Sealing: Typically used in conjunction with a 3/4" rubber or fiber washer (included in many versions) to create a pressure-tight seal without the need for excessive torque.

Grip: Features a hexagonal head or knurled edges for easy tightening with an adjustable spanner or water pump pliers.

Pressure Rating: Suitable for standard high-pressure mains water and closed-loop heating systems.

Finish: Natural Brass.

Common Applications

Washing Machine & Dishwasher Outlets: Capping off standard 3/4" appliance valves when the machine is removed to prevent accidental leaks.

Manifold Port Sealing: Closing off unused ports on underfloor heating manifolds or water distribution headers.

Outdoor Taps: Providing a secondary seal for garden taps during winter months or when not in use.

System Testing: Temporarily sealing 3/4" male threads to allow for pressure testing of the pipework.

Essential Companion Products

Sealing: 3/4" Rubber / Fiber Washers (Pack of 10)

Thread Sealant: PTFE Thread Sealing Tape (for a permanent metal-to-metal seal)

Valves: 3/4" x 15mm Washing Machine Valve

Tooling: Wide-Opening Adjustable Spanner

Specialist Support and Local Collection

Looking to seal off an appliance connection or a manifold port? We stock a full range of brass blanking caps and plugs in 1/2", 3/4", and 1" sizes for immediate trade collection.

Visit our trade counter at 61 Fullers Road, E18 2QB for expert advice on choosing the correct thread size and sealing method for your plumbing project.