Ref: ZHC21B / Quick disconnect grease coupler
The Groz quick disconnect grease coupler is designed for quick and convenient disengagement of the coupler from the grease/zerk fittings under pressure. To engage the coupler, simply press the thumb lever and slide the coupler onto the fitting. The hardened 6 cylindrical balls hold the grease/zerk fitting tight. Once greasing is completed simply press the thumb lever again to disconnect the coupler from the fitting.