I'm using a 1 1/2" firehose with milled aluminum end plugs from Binghams, one end has a metal valve stem(like a truck tire) that I slowly add 65psi of AIR pressure to, takes about 5 minutes?. I start off with a bike pump and slowly add air, when I hit about 55psi I stop using the hand pump.. I use my air compressor and take it up to 65psi, then form goes into oven...