Best Seller | HydroTools by Swimline Chlorinator Top Lid and Locking Collar 3-Piece Replacement Set Properly maintain all of your plumbing and chlorination lids and caps to ensure optimal performance - even one worn O-ring can cause air infiltration and disrupt system pressure. Regularly inspect all components and utilize the Hydrotools top lid and... more | | $28.99 FREE shipping go to store |