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.

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🔧 Nail your TPMS maintenance with precision and ease!

LIGHTWEIGHT COMPACT - At just 1.6 ounces and pocket-friendly size, it’s your go-to tool for on-the-spot repairs.
ERROR PROOF INSTALLATION - Twist-Til-Click mechanism ensures perfect valve core tightness every time—no leaks, no false readings.
PRECISION TORQUE CONTROL - Automatically adjusts valve cores to manufacturer specs, eliminating guesswork and protecting your TPMS.
ERGONOMIC SCREWDRIVER GRIP - Comfortable, easy handling designed for professional-grade vehicle maintenance.
COMPREHENSIVE INSTRUCTIONS INCLUDED - Get started immediately with clear, step-by-step guidance for flawless valve core removal and installation.

The Slime 20178 Valve Core Torque Tool is a lightweight, ergonomic tool designed to remove and install valve cores with exact torque, preventing costly TPMS damage and ensuring leak-free, accurate tire pressure readings through its unique twist-til-click precision feature.

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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

Slime 20178 Valve Core Torque Tool, Avoid TPMS Damage, Valve Core Removal and Installation Tool

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