Highland Deluxe Inline Second Stage Shut Off. 

Features:

• Install between standard regulator hose and second stage
• Slide machined Delrin collar to shut off gas flow
• Commonly used with deco rigs, stage bottles & drysuit inflation
• Prevent critical gas loss
• 9/16”-18 UNF male inlet to 9/16”-18 UNF female outlet threads
• Low pressure use only - below 200 psi

WARNING: When shutting off gas supply to the second stage, there must be some other type of over-pressure relief device present