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.

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Slime 20088 Valve Tool, 4-Way, Plus Valve Cores for all types of Tire

Slime 20088 Valve Tool, 4-Way, Plus Valve Cores for all types of Tire

Product ID: 3595478

🔧4-in-1 multi-function tool

🚗Compatible with all vehicle valves

🛠️Includes 4 replacement valve cores

Description

🔧 Fix your tire valves like a pro—anytime, anywhere!

EMERGENCY READY - Includes 4 spare valve cores to fix leaks on the spot.
COMPACT CONVENIENT - Small enough for your glove box or toolbox—always within reach.
UNIVERSAL COMPATIBILITY - Works seamlessly on car, truck, bike tires, and A/C unit valves.
ALL IN ONE VALVE MASTERY - Remove, re-tap, and ream valve cores with one compact tool.
COST SAVING DIY ESSENTIAL - Avoid pricey tire shop visits by handling valve repairs yourself.

The Slime 20088 Valve Tool is a compact, versatile 4-in-1 device designed for valve core removal, thread re-tapping, and valve reaming. Compatible with all vehicle and A/C valves, it includes 4 replacement valve cores, making it an essential, cost-effective tool for quick tire maintenance and leak repairs on the go.

Specifications

ASIN	B0020T17J2
Best Sellers Rank	#233,163 in Automotive ( See Top 100 in Automotive ) #136 in Tire Valve Tools
Brand	Slime
Customer Reviews	4.6 4.6 out of 5 stars (14,031)
Date First Available	March 25, 2009
Is Discontinued By Manufacturer	No
Item Weight	0.64 ounces
Item model number	20088
Manufacturer	Slime
Manufacturer Part Number	20088
Model	4-Way Valve Tool with 4 Valve Cores
Product Dimensions	4.69 x 2.69 x 4.5 inches

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