WADEO Valve Core Remover Installer Tool with Dual Size SAE 1/4 & 5/16 Port, 20 PCS Valve Cores with Teflon Seal and 10 PCS Brass Nuts, Compatible with R22 R12 R407 R410 R404 R32 R600 A/C

Excelente calidad del material, cuenta con adaptador 5/16" para R410a.

looks good

SO i was a HVAC tech for over 5 yrs in the 90's and never used a valve stem replacement tool by self.. On my home system i have or now had 4 leaking king valves on the HP units outside.I had watch a video on how to use the tool which was good but not expectually my experience. Make the first one on the easy to access did unlike what I did..When you screw the tool on the port dont get it so tight.. if you get a slight leak it not a big deal.. When you open the valve and push the rod into the port be slow and you might need to twist it as well to make it through.. (hold the tool up take the rod out to see the chamber you are sliding stuff through to know what you are feeling before hooking it up.. )When you start to remove the old stem make sure to gently push the tool on to the valve so it attached to stem,, as you start to unscrew stem the pressure will try to push the rod out of your hand so keep slight pressure on the end while you are unscrewing the stem.. keep turning till you feel it click which mean it out of the treads on king valve.now gently start to guide the extrector back with old stem, no need to pull as the pressure is pushing you back, making sure to be easy when you get started and twisting can help it through the bore.. On the first one when i pulled the rod back and tried to shut off valve on tool it would not turn as the stem was sorta in the way.. you back push back in to see if you can catch the stem to pull it back past the valve to shut off pressure.I was able to push the stem toward unit enough when i pulled rod back without stem but was able to close the valve on tool.. I removed rod by unscrewing the end and would quickly open the valve shooting the old stem out and then shut it off.. (make to be out of the way and it come with force. )put new stem in the tool , place back in bore and screw down the nut, open the tool valve and push the stem back in.. keep pressure on knob on rod as the pressure is pushing you back the whole time. when you get it to king valve hold finger on know to keep in in place and slowly turn to tighten the stem back in.. get it snug but not over tight.. they will stip out and you are SCREWED.I then pull rod back through bore and turn valve off.. unscrew the rod and then slowly crack tool valve to release pressure can conform the stem is sealed.. you will hear a slight purge then it done. anymore and you need to redo the stem.go slow and feel everything and try to not screw it up.. Wish i had a video to share but that a lot of work by yourself and needing both hands.hope this helps.. it saved me hundreds to get this done by HVAC repair company.. allthey want to do now days is replace older stuff. these unit are 1991 HP but converted to straight AC in 96 and we dont keep it 70 in summer in NC.. so not a lot of hours.. and its R-22 which is still have a couple tanks of from past business.. yes EPA certified tech.. :)

This is a must to have for your AC work. It saves you time and money not losing the coolant when changing the valve.

Excellent quality