Air Switch Chrome Spa button CRBMeet the CRB Air Plunger a precise, reliable replacement actuator engineered to deliver consistent, fault free operation for pneumatic spa air switches. Built to perform under the damp heat of spa environments, this plunger turns a simple press into a dependable signal for your spa control system, so your hot tub, whirlpool, or bath stays responsive when you need it most. Broad compatibility: Operates with a wide range of spa air switches, including