Low point drain valve leaks

Does anyone know what the replacement part (manufacturer and part number) is for the low point drain on the 1995 model 3023?

We've got a pinhole leak that started after we replaced the city water inlet. Must be the next weakest link in the chain.

Camping World was guessing at a part for ~$20, but I think it should be a ~$5 part.

Attaching a photo in case they are not all the same.

[B_and_D]

We had a leak in one of ours, too. I bought two replacements from RV parts stores and they both leaked. Finally bought a brass valve from OSH and so far no problems. It cost less than $5.