Any suggestions for a replacement cap to hold air in an REI "Relax Queen Air Bed"? REI doesn't have any parts - the mattress is at least 7 years old. The plastic plumbing caps at Ace Hardware on Willy St. have the wrong thread pitch, even though a 3/4 inch diameter cap was roughly the same size as the threaded hole.
I searched the web (Ebay, etc.) without any luck.
A 1" twist-turn drain plug at Ace worked, but having a brass piece extending above the mattress seems less than ideal.
Here's a link to e photos, including the drain plug:
As always, thanks for any help.