VGFM Gate Valves FxF Manufactured to BS 5154 PN25 Parallel threaded ends to ISO 228 - IMPORTANT NOTE, MOST PLUMBING PRODUCTS ARE STATED AS BSP IMPERIAL THREAD MEASUREMENT WHICH MEANS THAT ACTUAL DIAMETER OF THE THREAD SIZE IS APPROXIMATELY 1/4 INCH LARGER THAN THAT STATED IN BSP TERMS. FOR EXAMPLE THIS 2 INCH BSP THREAD ACTUALLY MEASURES APPROXIMATELY 2 1/4 INCH IN DIAMETER