1. Machined from solid steel barstock for durability. 2. The QKTL Series employs a threaded sleeve locking mechanism,mates with matching male threads on the nipple.The two halves must be manually threaded together for connection. 3. Hard,chrome alloy balls are used for valving. They a spring loaded for positive seating of the valve. 4. The valve provides a metal-to-metal seal between the ball and a coined seat. 5. The body seal is polyurethane which resists high pressure extrusion. 6. A threaded valve retainer provides a valves stop that assures positive valve alignment.