Hello. I purchased a home with an inground pool at the end of last summer and am now attempting to open it for the first time. The pool uses an Autopilot SWCG system. Before starting the opening process I removed and cleaned both the salt cell and union screen. After removing the union screen I noticed a loose piece of plastic plumbing resting at the bottom of the pipe below where the union screen sits. The piece is conical in shape with a 1.5 inch diameter at its widest point. There are a few nicks and rough spots along its rim but no jagged edges or any other evidence that would suggest it broke off another piece of plumbing. Attached are a few pictures I took of the piece and the location of where I found it. Does anyone have an idea of what this could be? If it's a vital piece of the pool plumbing I want to make sure to get it repaired or replaced prior to opening. Thanks in advance.