Air and Hydraulic System Accessories Betts Industries’ accessories support air or hydraulic systems. Hydraulic Distributor for Single Compartment Hydraulic Distributor (Basic Configuration) Fusible Plug Fusible and Frangible Plug Hydraulic Distributor with Vapor Valve Isolator 3-Way Air Valve Interference Control Valve Pressure Gauge Pressure Indicator Pressure Gauge (1.625”) Attach Fitting Manifold Air Control Panel- Push/Pull with Master Control Air Reset, Gauge, and Indicator