Yes you pressure test it at 120 psi threw both holes blocking the out going hole and the lower back hole that will insure its sealed tight and not going I pressured our shop lines to 180 and hit it with air and mines as secure as a weld but I didn't use jb that stuffs been problems for me since the first day I used it there are much better products to block the passage with then jb products they don't do we'll under heat and or pressure in my hop