West's information - CHOH sand CHOH torch with gases - would not have known that. Excellent resource. My cycling sneakers are NB terrain running. The soles come off from pedal action. Wal's two part epoxy for rubber does it to glue back using plywood sole shapes and depp reach clamps. Wal does sell a 2 partb epoxy for plastics and poly.
What I have is from West Marine: Flex Set fom ITW Polymer Technologies at marinetex.com

The USP fittings are experimental. The one nut fitting's threads are filed down to accept a 5/16ths Spa hose, the larger 2 nut for
running the hose thru the fitting surrounded by a wad of urethane. With epoxy fillet. I do not know if the one nut fitting's constriction reduces the air flow from the air switch to air switch relay causing an inoperation at the relay. I should look at adding filler to the Flex Set for a paste in the 2 nut fitting.

The air switch is female taking the poly hose inside the fitting. Not so good. I find an elbow to glue in there or thread the female if OD pipe sizes fit threading.

Best to drill, set up then use the epoxy.