Each union is thoroughly inspected to ensure long, dependable service in the most extreme conditions. Available in stock at our distribution center in houston. Three lug nuts and self-locking acme threads provide quick make-up and break-out Color coded for quick identification Unique identification for sour gas unions Meet or exceed national association of corrosion engineers standard nace mr-01-75 and api rp-14e Manufactured from quality steel meeting astm and/or aisi standards All unions provide pressure-tight & positive sealing for low-pressure services (500 to 2, 000 psi) The spherical surface male sub and angular surface female sub form a metal-to-metal seal, the ball and tangent provides a perfect seal Range from 1/2 to 12 with cold working pressures from 500 to 20, 000 psi Fully interchangeable with most major brands of hammer unions