mempilot

Spray it down with the soapy water while you put positive pressure on the loop via exhaling into the DSV. The OPRV will allow the excess escape pressure to escape, but it will keep the loop at maximum pressure. You should get some bubbles if there is a leak somewhere other than the OPRV.

To check for a small negative leak, put paper towels inside the CLs, the hoses, etc. Put a vacuum on the leak by inhaling on the DSV, and then shut the DSV. Submerge it in a tank or pool for a while, then pull it out and check where the paper towels are wet. It will put you in the general area of the leak for further inspection.

I've found a pin hole in a loop hose that was not noticeable during a visual inspection. They sometimes develop where the hose attaches to the plastic T-pieces or threaded collars due to stress placed there when the unit is sitting with the looped draped down in front and not up in the mouth.

Just some ideas.

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Eric Stadtmueller, otherwise known as, MEM "Da Pilot"