40mm EASI-FLO Shallow Bottle Trap 38mm Seal WTBT4038-1½" BOTTLE TRAP (38MM SEAL). 1½" Bottle Trap (38mm Seal) A bottle traps bottom section can be removed providing an easy clean solution. All Magna traps have a universal outlet suitable for use with push-fit or solvent weld waste pipes. The water seal is the height of water stored in a trap to prevent odours from drainage. Suitable for 1½" Pipe 38mm Water Seal Removable Bowl Universal Outlet Suitable for Plastic, Copper & Lead Pipe Manufactured In High Quality Polypropylene