This pump assembly combines the S-216-JN standard pump (non-lubricated air type) with a one-gallon (3.8 liters) steel reservoir. No additional contaminants are exhausted from the pump. Readily adaptable to portable power pack use. Also suitable for stationary use to provide hydraulic power for production machinery or for hydrostatic testing. This unit is not available in 150:1, 200:1 or 300:1 ratios.