Hi Brent, it's good advice on the deck-hatch/pie-plates maintenance.Just M2cw leaking and poorly maintained deck hatches lead to water leaking onto tank foam and water saturation. . Good idea to service and replace O rings or replace entire hatch. The wood deck edges should be sealed to protect the deck
Look at Tempress or Beckson hatches, and look for O ring supplier in area - someone will have them or buy online from MCMaster Carr, Grainger, etcHi Brent, it's good advice on the deck-hatch/pie-plates maintenance.
But sometimes it's hard/impossible to find replacement 'O' rings, as Parker has changed brands of the 'pie-plates' a number of times. For example, our 2013 2020 has 'pie-plates' made made by Innovative Products Solutions, Part# M6AP.... They, and 'Go-To-Marine' (the supplier) are long out of business. I have not yet be able to find specific replacement 'O'-rings for them, but I have found something 'close' at a local farm-supply/Agri-Supply. They are not a perfect fit, so I will likely replace the entire pie-plate with a brand that I hope will be around awhile, and has replacement parts available; when I change them, I'll buy a large supply of 'O'-rings, and store them in a sealed container after soaking them in 303 Protectant.
The Innovations Products Solutions have a 'very special' size 'O'-ring... I think they were manufactured in the Delta-Quadrant (for you/us Star Trek fans!)Look at Tempress or Beckson hatches, and look for O ring supplier in area - someone will have them or buy online from MCMaster Carr, Grainger, etc