Can I use this to replace the Schrader Valve on my car A/C R12 System

Usually for A/C you would use a tool that would keep the A/C system presurized after core removal. With this tool you would lose all presure and have to recharge the whole system. That being said, if you have no pressure in the system at all you could use this tool to replace the cores as long as they are the same size as standard inner tube valve cores. I have used the tool and valve cores on a fuel injection system on a car but not A/C.

Will these cores work with mountain bike presta stems?

These are for car stems actually. They are however the same. They are both Preston stems the core however is different. These stem cores are of the short, car, variety, not of the long spring type usually found in bike tires. The tool however is a great one to have in you box. It fixes just about every type of valve stem problem, from rethreading both inside and outside threads, valve core tool to r and r the core. It will even fix a crushed stem. Although I have no idea why you would want to.How this helps.

Does it have directions

No directions, but it tells on back of package what the tool can do, and you can go to YouTube, and theres videos on how to use the tool.

Made in China. I know a guy who was made in China. His name is Zhong and he's held up pretty well over the years, so hopefully this valve core tool will, too.

Manufacturer	Slime
Brand	Slime
Model	Slime 20178 Valve Core Tool
Item Weight	1.6 ounces
Product Dimensions	5.38 x 2.13 x 7.31 inches
Item model number	20178
Manufacturer Part Number	20178

20178 Valve Core Torque Tool, avoid TPMS Damage, Valve Core Removal and Installation Tool

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