DIVEWATCHDOCTOR
Contributor
Not for use under pressure, but he is not using it that way; his external pressure just makes the plug tighter rather than trying to blow it out the end of the fitting.HP Gauge Hose Plug Set — XS Scuba - Everything For The Perfect Dive
O-ring sealed plugs for both ends of the hose Create a watertight seal Machined from Delrin Never pressurize hose with plugs in place p/n TL130 The interior of scuba hoses should never be exposed to any type of cleaning solution. Damage can occur from the break-down of the inner lininwww.xsscuba.com
Agree that the applied pressure will not blow out the Delrin cap but when you pressurize the chamber it'll be subjected to 4 or 5 ATM external pressure that could open a hole in the Delrin if not thick enough. I'm not saying it will happen (not an expert on materials resistance). All I can say is we use a bronze 7/16" UNF cap bought in Home Depot a long time ago without any issues.