This is the Hog D3 1st Stage Sealed Scuba Diving Regulator Features: Environmentally sealed for contaminated or cold water use Constructed of both Trivalent-Chrome and Black Zinc Chromate Plated Brass High Performance Low Profile Balanced Diaphragm 1st Stage 5 LP Hose Ports on compact swivel, 2 HP Hose Ports HOG's newest and best Diaphragm Regulatro Yet. Balanced Diaphragm, 2 HP and 5 LP Ports, Compact size, routes like a balanced piston but is a Diaphragm! 5 Port LP Swivel rotates 360 degrees with hoses, unlike most tech swivel regulators. Higher performance than the HOG D1.