Yes it is a twin, at the moment it doesn't seem to be holding it pressure as well as it used too, using the rattle gun last night it was dieing very quickly and not undoing the nut, might need to look at the pressure reg to see what's going on.

I have 3 compressors the one pictured, a JUN-AIR button compressor MODEL 6-25 (mines 35yrs old) and a 10CFM Ingesol Rand.

http://www.jun-air.com/sw1386.asp

When it's on you can hardly hear it, used mostly in dentists surgerys and labs.

Baz.