I have an official vacuum pump, not sure what pressure it operates at, doesn't seam to be bone crushing vacuum. I use 4 mil poly. Peel ply, doublestick foam tape for sealing, and a polyester fill material to absorb exess resin and maintain a space for the vacumm to operate in, I get from Fiberglass Supply in Bingen, WA at what seems to be reasonable prices. The pump came with a piece of clear, soft plastic tubing, maybe 3/8" i.d., that has a bunch of slashes cut into it at the end. This end is inserted into the bag and sealed with the tape. Been workin' great, have had a bit of practice.


Dave