Review on 🔧 MASTERCOOL (81490) R134A Valve Core Remover Installer - Yellow Gold, 6.8 Inch (Standard 5mm Valve Cores Only) by Lequon Kaneshiro

Bought to replace Schrader AC valves. Replacing the lower valve was done in 2 minutes! The high valve didn't fit at all. Master Cool does NOT provide any technical documentation or specifications. They don't even know what is suitable for "universal". An absolute hit/miss with an absolute chance of selling the complete set for $135.00. In particular, when I used the Master Cool Schrader tool on the high valve, the 1/2" portion of the piston was too short to snap the Schrader valve in for unscrewing. When I try to push on the plunger it either can't reach the Schrader valve or the plunger diameter is too big for this tool to reach the Schrader valve, otherwise it's unreachable. They don't sell longer piston parts, and Mastcool's chief engineer doesn't even know which of their tools is for which cars. You have no idea. You only know which printer took the millimeters for the low and large valve diameter clutch. I gave 2.5 stars because it only worked for half the job. Unfortunately, the high valve always leaks. This tool is not suitable for the broken part. The folks at Mastercool have no technical documentation to share, and they have no idea if their product is right for any vehicle, any place, any time. It's like building the world's first hammer and saying it works "universally" with all bricks.