The grey coupling nut screw connector can be found at the ends of the A (AirJet Blower) pipe of your Lay-Z-Spa or Saluspa AirJet pump.  The Coupling Nut compresses a rubber gasket (included) to form a water and air tight seal.
The following steps should assist you in replacing the connector:
Remove the existing coupling nut (undo screws either side to release)
Remove the existing stepped rubber gasket
Refit the coupling nut with the supplied replacement stepped gasket
Please be aware that this part is only compatible with AirJet pumps, both original Egg and newer Cube design and the older style HydroJet pumps.
These grey coupling nut screw connectors and nipples can be found at the ends of the B & C (Water Flow and Return) pipes of your Lay-Z-Spa or Saluspa AirJet pump.  The Coupling Nut compresses a rubber washer (included) to form a water tight seal.
The following steps should assist you in replacing the connector:
Remove the coupling nut (undo screws either side to release)
Loosen and remove the jubilee clip
Using a hair dryer, warm the pipe
Pull the coupling nipple free from the pipe
Whilst the pipe is still malleable, insert the replacement coupling nipple
Reattach the jubilee clip, be careful not to overtighten as this will damage the part
Refit the replacement coupling nut with the supplied replacement washer
Please be aware that this part is only compatible with AirJet pumps, both original Egg and newer Cube design