Check out my other items !Be sure to add me to your favorites list !Scubapro MK7 Air I regulator. Used but just serviced and it works great. MK7 balanced piston, 3000 psi, yoke style 1st stage with 1-7/16" HP ports and 2-3/8" LP ports. LP swivel adapter included, has 3-3/8" LP ports if you choose to dive this and want to add an octopus and inflator hose. Comes with a 27" x 3/8" regulator hose. Air I 2nd stage is the predecessor to the D400. Easy breathing, dive/predive switch, and unique design helps reduce bubble interference. 1st stage has some knicks and dings from wear and tear but the 2nd stage looks great. One of Scubapro's most popular AUDIBLE regulators (before spg's were used). This is the one that "honks" when tank pressure gets to about 400-500 psi. Parts are still available to have them repaired and this one looks and works great. A nice reg. for the collection or go diving with it tommorrow. For certified divers only. As always, have life support equipment checked by your local dive shop. Sold as is, Good luck, Have fun, and Dive safe.