Pin Depressor is anything that depresses the pin on a screw on style tank wether it is CO2 or compressed air. We offer many different style, colors, and brands to choose from. Some are your basic design while others have an on/off built in to shut the air off to your paintball gun. Some even have built in exhausts to vent the air in the line when you shut it off. All Pin Depressors come with standard 1/8" NPT ports for easily attaching hoses and fittings to get the air from your tank to your paintball gun.