Comet Pump part 5019.0049.00 18mm Hot Water Seals ONLY for LW and HW series pumps. This kit contains only the seals, no other parts. HW pumps require (2) TWO of these kits! JN Equipment stocks the largest selection of Comet Pump Parts and Accessories in the U.S.A. Note: HW pumps require TWO of these kits !!