Has your Bestway Lay-Z-Spa AirJet pump developed a crack around the Air Blower External Connector?  This tends to be caused when the fasting nut has been over tightened.
This part has been removed from a brand new model S100102 pump, it is also compatible with model S100202 and Pre 2020 HydroJet Pro pumps.
This part is approximately 13cm (5 inches) long and is NOT compatible with legacy egg shaped pumps which require the shorter 10cm (4 inches) version.