Thanks for the replies. I removed the toilet and there is no name tag anywhere. But the lid does say thetford. Ordered a new one rather than buy parts to fix because the parts, lid, valve and gaskets almost as much, over half the price of new. And the T bolts were so corroded I had to cut the bolts off with my angle grinder which heated up the bolt and damaged floor flange and toilet base. And besides my DW had already said just buy a new one??. Happy wife .....you know the rest and it’s been over 50 years we’ve been married.