BMW e39 e46 z3 Water Pipe + O-Rings (Hose - Engine Block) Water Pipe with O-Rings Water Hose to Engine Block Brand NEW part with full 1 year warranty. BMW part# 11 53 7 502 525, note the mid-year splits. Genuine BMW part, recently made: not been lying around. PLEASE NOTE: z3 fits from 09/1998 production date onward.