There are some things you can buy at Home Depot for the RV, and some things you can’t.
That being said......
Just buy a Dometic 310 or 320 toilet and you get the soft close lid with it.
Such a deal.
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Ken and Terry
2018 Sunseeker 2430S-CD, nicely modified and carried by a 2017 Ford E450 Sport
Former Georgetown 330TS owner for 10 years with more mods than I can count, pushed by our 2017 GMC Terrain