Yep. That’s the “old school” inlet connector. The check valve is built into that fitting. Like I said, pop the screen out & you’ll see the stem of the check valve in there. Looks like your fitting is held in there with some Dicor or some other type of caulk/adhesive. Maybe just a white grommet, hard to tell by the pictures. You should be able to pop it out of there with a little help from a heat gun or the wife’s hair dryer. Replace with the newer style that is brass with a 3 screw flange around it. Might need to use machine screws with nuts on the back side.
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