This is a set of replacement B and C coupler seals. Is your pump leaking from either the B and/or C hose ocupler connections on your Besstway, Coleman or Lay-Z-Spa hot tub? The most likely reason is that the seals inside those connections have failed. Please note that this is for the rubber seals ONLY and not the couplers themselves. If your tub has two filters you most likely have a Y adapter on the C coupler connection that attaches to a hose that spans around the tub to the second filter. In this case you will want to purchase two sets of these as you will need them for the Y adapter and the second filter connection. The B and C coupler seals will fit all AirJet model tubs with either the egg style pump/heater shown on the left or the newer rectangular model pump/heater unit.