The model const131 hydraulic hand pump is a dual pressure source with the ability to easily adjust and stabilize. This hand pump possesses both 90% vacuum and positive pressure 9000 psi; uses oil or deionized water as the media, and can adjust the pressure easily and stably. In order to avoid the enhance pressure seal ability, the const131 didnÆt use the check valve (non-return valve) but use the helicoidal pump, that makes the const131 is very easy for pressurizing and is much better than other pliers hand pumps. The adjusting resolution is up to 100 pa (1 mbar). These features make the const131 ideal for calibrating pressure transducers, precision pressure gages, and other pressure instruments. Connection Direct connection If the connector of the unit under test is m20*1.5, please connect it with the hand pump directly. Connect by pipe If the connector of the unit under test is not m20*1.5, please use the other adapter to connect. Specifications Media: oil or deionized water Generated pressure range: 13.5 psi (0.9bar) vacuum to 9000psi (600bar) positive pressure Pressure resolution: 100pa; 1 mbar Material: Ram/adapters: 316 ss; Body: steel/aluminum; Seals: buna-n. Test gage connection: m20*1.5; 1/2+ npt with included adapters. Reference gage connection: m20*1.5; 1/2+ npt with included adapters. Height: 47.24+ (120 mm); Base: 98.43+ (250 mm) x 55.12+ (140 mm). Weight: 3.31 lb (1.5 kg).