This heavy duty 16 oz grease gun develops pressure to 10,000 psi when needed. The unit features 3 way loading: cartridge, suction or loader pump. Features a heavy duty lever with adjustable linkage for high pressure or high volume operation and a loader fitting. Delivery is 1 oz per 16 strokes in high volume mode. Delivery is 1 oz per 25 strokes in high pressure mode. Gun ships with a rigid extension and coupler. Manufactured by Alemite.