Stem Adaptor (BSP Thread)

Black Acetal Stem Adaptor (BSP Thread)
Disclaimer: All images are for illustrative purposes only.

You will also need:

Locking Clip

Locking Clip

Prevents accidental disconnection of a speedfit fitting. Locks collet into position.

Quickly and easily converts a push-fit to MBSP thread and connects two John Guest fittings to create a swivel type connection.

John Guest stem adaptor (BSP thread) adapts a push-fit connection to an imperial threaded connection. Fast and simple to install, John Guest Air and Pneumatics creates an instant connection and airtight seal without the need for tools, hot works or sealing agents. Air piping systems can be set up and installed 50% quicker than traditional methods.

The unique collet locking design firmly and securely holds the pipe in place without deforming the pipe or restricting flow. Fittings are also fully demountable, reducing system downtime during maintenance and making it quick and easy to modify or extend systems.

Designed in tough engineered plastic, fittings are compatible with John Guest nylon, powder coated aluminium or LLDPE tubing, as well as copper, PEXa and other soft metal pipe materials. All John Guest fittings are manufactured and assembled in the UK.

Features and benefits

  • Strong acetal copolymer fitting with nitrile O-Ring
  • Airtight connection with superior flow characteristics
  • Instant push-fit connection and demountable without tools
  • Secure collet cover prevents accidental disconnection
  • Suitable for air and pneumatics piping systems up to 10 bar
  • Ideal for air, inert gases and vacuum applications
  • Food grade fitting suitable for potable liquids
  • Compatible with soft metal or plastic pipe/tubing


BSI Thermo Pipes and Fixings accredited
SKUDescriptionStem OD mmBSP ″Quantity per bagQuantity per boxAccreditations
PM051213EStem Adaptor (BSP thread) 12mm × 3⁄8″123⁄810200
PM051214EStem Adaptor (BSP thread) 12mm × 1⁄2″121⁄211150
PM051513EStem Adaptor (BSP thread) 15mm × 3⁄8″153⁄812150
PM051514EStem Adaptor (BSP thread) 15mm × 1⁄2″151⁄213100
PM051814EStem Adaptor (BSP thread) 18mm × 1⁄2″181⁄214100
PM052214EStem Adaptor (BSP thread) 22mm × 1⁄2″221⁄215100
PM052216EStem Adaptor (BSP thread) 22mm × 3⁄4″223⁄41050