These couplers are designed for high pressure applications such as hydraulic rams, hydraulic jacks and pumps. This 3/8 male coupler connects to its female equivalent. Features: 3/8 Body, 3/8 NPT Female Thread. Hardened Steel. Ability to connect and disconnect under pressure. 10,000 PSI Rating. 32,000 PSI Burst Rating (Coupled). What's Included: Male Coupler.