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The Vindicator Scuba Tank Safety Handle's Patented Red/Green Indicators let divers know at a glance that their air Is on. Vindicator Handles take only a minute to install and can be retro-fitted on most manufacturer's scuba tank valves. (Select the Model Number you need from the list of valves that Vindicator Handles fit) Model Fits These Valves Model #1 Halcyon Model #2 Catalina, Dacor, OMS, PST, Sherwood 4000 & 5000, Thermo Model #3 Dive Rite, Scuba Max, Scuba Pro Model #3SP Yo