Review on Unlocking Efficiency: Introducing the Lisle 19700 Valve Holder by Raden Maldonado

Looked good straight away. The threads are brass so as not to tear off the head. double size O-rings for sealing. The problem is that there aren't enough threads. Actually only 3 threads per step, hardly. Tried to get it to engage enough threads to stay sealed in the first cylinder. Go to the second cylinder, it was toast. Didn't want to sew/seal. I suspect it was partly the soft brass, partly the short thread size, and partly the uneven hose bend. But on cylinder 2 it was useless. I ended up disassembling the old compression test kit to finish the next 7 cylinders. I do not recommend.