Reddit reviews Mastercool (58531) Black R134A Standard and JRA Valve Core Remover
We found 2 Reddit comments about Mastercool (58531) Black R134A Standard and JRA Valve Core Remover. Here are the top ones, ranked by their Reddit score.
Designed for use of servicing valve cores in R134a systemsValve core remover/installer for standard and JRA valve coresAccess and change valve cores while the A/C system is still filled with refrigerantStainless steel ball valve design and patented thread remover lets the user block off the system while changing the valves cores, allowing for no refrigerant lossU.S. assembled and tested
https://www.amazon.com/gp/product/B0015KH93K/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1
Nope. I used one of those ball valve dealies. It still had a partial charge when I swapped the valves. Only a little vented while I was changing the valve; not enough to reduce the system pressure more than a PSI or so.