Pentair PacFab Dynamo Trap Lid

This lid is specifically designed for Pentair PacFab Dynamo pumps. You should verify your pump model number against the manufacturer's compatibility list or check the part number 354531 on your existing lid to ensure a perfect match.

Even a hairline crack in your pump lid can break the airtight seal required for the pump to prime correctly. This leads to air leaks, reduced suction power, and potential overheating of your pump motor.

Yes, it is highly recommended to replace the O-ring whenever you install a new lid. Over time, O-rings compress and lose their elasticity, so using a fresh one ensures a watertight seal and prevents future leaks.

Installation is straightforward and typically requires no special tools. Simply unscrew the old lid, clean the threads and the O-ring groove, lubricate the new O-ring with a silicone-based lubricant, and hand-tighten the new lid into place.

First, ensure the O-ring is properly seated in the groove and not pinched. If it continues to leak, check the pump housing threads for any debris or damage that might be preventing a flush seal.