White Rectangular Channel Connector - 60mm x 204mm:White Rectangular Channel Connector with Non-Return Valve. Equipped with a backdraught damper for backflow prevention. Lightweight Rectangular Channel Connector. Flame retardant. Quick and easy fit. Specifications:LightweightMaterial: PVC PlasticColour: WhiteFlame retardant.Features: Channel Check Valve, Coupler, Adaptor, Backflow.