This is the XS Scuba EZ QD Quick Disconnect Adapter - Options Features: Convert any standard regulator hose to a BC quick disconnect hose Installs on the second stage end of a regulator hose Six point attachment with six ball bearings EZ" QD design, just push to attach - no need to pull back the collar Wide easy grip collar A favorite for drysuit inflation hoses Chromed brass construction Low pressure use only - below 200 psi Factory cleaned - Viton o-rings Gripping your inflator or dry suit hose with two fingers, while pulling back on the locking collar with two more fingers on the same hand is difficult if not impossible for some people, using two hands means you need a third to complete the task. XS Scuba&';s has a QD Adapter that converts any LP hose into an EZQD Hose. Hose adapter eliminates this hassle and allows one handed installation, just place adapter over the end of the QD fitting of your BCD inflator or dry suit valve and push it into place. "