If I recall, the seal is kind of a long thin string of rubber. Although the string itself forms a long circle, the cross-section (the shape of the string) is not round. It must be inserted carefully into the track, so the cross-section is oriented to fit the track, proper side up, not twisted. Is yours broken? Is it squashed out of shape? Is it twisted? Is the groove into which you install the string clean? Is the underside of the seat in this area clean and smooth? Note that the string must stay properly oriented as you lower the seat onto it and fasten it down.
Occasionally you will see someone here on the Forum offering his Thetford for sale. If your string is broken or deformed, you might send him/her a note, saying that if no one buys the toilet, you would like to buy the string.
I never heard of Pdxrvwholesale.com, so I can't offer any opinions.
Bill
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