Single EF30R 22mm x 22mm x 1/2" End Feed Threaded Centre Tees CxCxBSP Copper/Brass. - 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 1/2 INCH BSP THREAD ACTUALLY MEASURES APPROXIMATELY 3/4 INCH IN DIAMETER