15mm x 3/8" chrome plated brass male iron adaptor meeting BS EN 1254-2 For further chrome plated compression fittings press this link - 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