BSP / NPT · compression & quick-release couplings

Fittings & Adaptors

A brass compression fitting isolating valve on 15mm pipe.

Thread standards are not interchangeable: BSP (British Standard Pipe) and NPT (National Pipe Thread) fittings look similar but are not compatible with each other, and mixing them can produce a joint that appears tight but does not seal. Every fitting we list states its thread standard, size and connection type — compression, quick-release or threaded. An isolating valve fitted before a spur or appliance connection is good practice, as it allows maintenance without draining or shutting off the whole system.

Typically specified for

  • Joining dissimilar pipe or hose standards
  • Isolating valves ahead of appliance connections
  • Cylinder-to-regulator adaptors
  • General compression pipe joints

Gas components must be fitted, connected or serviced by a Gas Safe registered engineer. ProfessionalGas supplies equipment and parts only — we do not carry out installation, connection or repair work.

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