Review on 🔋 Wheel Masters 802990 90 Degree Valve Extender - Pack of 2: Enhance Tire Inflation Access with Convenient Valve Extensions by William Lin

This product is marked as a front wheel on the packaging and I don't know why. I use it for my external dual rear camper tires as the stem is rubber and flexes to take pressure as it is very close to the hub so difficult to access with a tube. When they are installed, air will come out of the tire and require a wrench to tighten and then more air. It comes with caps. I believe this opens the tire's valve and in the air section they have their own valve as it is 90 degrees. It works well as I can put my finger behind it to support the rubber bar. I see you can get a double rear tire stem for about $1 more, but the reviews aren't great and don't work for some. they look a little shorter. I recommend it, would buy it again and hope it helps.