PLASSON 7150 25mm x 1/2" BSP Female Parallel Elbow for MDPE pipe which is supplies as standard with polacteal split rings and NBR O -Rings which are suitable for water. Tested and approved by WRAS to PN16 - 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