Have a pair of these gauges (center mount) to replace old gauges on my Craftsman 25 gallon air compressor. I love it so much I also got a top mount version of this gauge for my new portable air compressor I'm retrofitting as a project. Fittings 1/4. You will also need a 1/4 to 1/8 adapter to fit a standard air regulator. This increases the height of the sensors. Sturdy, well made and not that expensive.
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