was asked to post this on another thread but figured id start a new thread so others may see it.I recently got some casings from cabelas that are 19mm smaller then my smallest tube so off to the hardware store i went first stop lowes i got a 5ft section of 3/8 pex then off to ace hardware for some 1-1/2" nylon washers with small hole cut my section of pex off smoothed the edge then flared it drilled the nylon washer out so it tightly fit the pex and slid it as tight as i could to the flare and done pex tube 1.78 washers .50 picked up 3 so with gas under 7 bucks for 3 tubes gave one to a buddy and i have a spare have enough tube to make a few more here is some pics of finished tube.Hope it helps someone i wanted to use the casings that day couldnt wait to order a new tube.lol and the pressure pushing against the flare when packing pushes it tighter on to the washer for a tight seal