Highly durable aluminium die-cast head with air release valve. Dual piston mechanism results in increased output per stroke. 3-Way fill, with cartridge, bulk or suction. Accepts standard 400g cartridges. Supplied with 150mm bent steel extension delivery tube and 35mm coupler. Knurled grease tube and rubber handle for greater precision. Features variable stroke for controlled grease volume. Dual inlet of grease ensures that the gun does not lose prime.