I have been installing a p-valve in my Black Ice this week. It started on Saturday with determining placement and then sticking on a piece of aluminum tape with an appropriate size hole as a guide. I burned out the hole with a soldering iron, using a larger size socket on the backside to keep from damaging the rest of the suit. After the hole was made, I used a 1/2" bolt with 2x 2" washers and tightened the whole thing down for a day or so. Last night, I roughed up the gaskets with sandpaper and glued them on each side of the hole using RTV silicon sealant, and then put the washer/bolt system back on. Tonight I will put on the rest of the p-valve assembly. I've going diving this weekend and would like to know how I can test the valve for leaks. Short of filling the bath tub and sitting in it, anyone have some ideas?