EF03 Male Iron Adaptors CxMI - 15mm x 3/8" High grade product to BS EN1254-2 - 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 3/8 INCH BSP THREAD ACTUALLY MEASURES APPROXIMATELY 5/8 INCH IN DIAMETER