hi, welcome to the land of the newells. it is a Thetford fitting. harder to find than the regular valterra ones you already bought.
just do a search online and see who is selling them. it changes. they are also used on the older airstream trailers.
camping world used to have them, but seems they have gotten rid of all of them.
i would suggest when you find them to buy an extra or two. the last ones i got i paid 6 or 8 bucks plus shipping for them.
tom
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