They have both the bottom and back mounts.. Their gauges only go to 30 lbs., which I like as it makes it easier to read.
If your current filter has a screw in gauge, the TFP gauges will work. I think some Jandy filters have a one piece filter and air relief valve, which can't use the TFP units.
I have them on my pools and love them.. Glycerin filled so they don't freeze.
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