ORIGINAL: seanreit
Those fill valves leak, ask Todd at Dreamworks, they are pieces of junk, originally put out by air pac.
Get the BV fill valve, have worked flawlessly for me for years.
Unfortunately, I've had a bunch of leaks with the BV fill valves. I switched over to the Clippard parts at a fraction of the price, and have had much better luck.
Clippard part # is MQC-3 for the assy including the filler adapter, and MQC-V3 without the adapter. You will need to add a 10-32 screw-in barb too, but it still comes out at less than $3 a pop.
Gordon