Porter Cable 904749 Replacement Collar - Compatible with Porter Cable Routers & Tools - Durable & Secure Fit for Woodworking & DIY Projects

First note: Don't leave your nail guns plugged into air when not in use! My Porter Cable DA250B nail gun was plugged in for a few hours and suddenly the air compressor started. I didn't think much of it until the compressor didn't shut off for 10+ minutes. I turned it off and heard air coming out of my Porter Cable DA250B nail gun at a high rate.I did some googling and found this part was the problem. I unscrewed the 4 hex bolds on the top of the nailer and saw the collar was torn/broken. I put it back together temporarily till this part showed upI purchased this part and it showed up in 2 days on a Saturday.Literally less than 5 minutes and my nailer was up and runner. I did add a bit of oil on the collar when installing.Nail gun works perfectly after this!So if your Porter Cable DA250B 15ga angled finish nailer started leaking air, Open it up and check to see if the collar was torn/broken. If so, this is the part to get!