Features: . Made of ABS plastic body, rubber washer, and corrosion-resistant steel spring. High quality and can withstand the immersion of seawater. Scuba diving standard with overpressure valve / pressure relief valve for lifting bag and BCD. Prevents rupture, lightweight, strong, durable, and portable. Allows quick air release as needed and helps prevent accidental over-inflation during inflation, enhancing diving focus. Over pressure valve (OPRV) for BCD, SMB, lift bag, and other buoyancy devices. Includes drawstring lanyard. Easy to assemble and easy to use. Specially designed for water sports. Scientific design, professional equipment, high-quality materials, comfortable and durable. Specification: Size: approx. 5.2 x 2.7 cm / 2.05 x 1.06 in Color: Black Material: ABS Package Contents: 1 x Over Pressure Release Valve Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement allowance is +/- 1-3 cm.