Features: and high quality, Made of ABS plastic body, rubber washer and corrosion-resistant steel spring. High quality, can withstand the immersion of seawater. Scuba diving standard with overpressure valve/ pressure relief valve for lifting bag and BCD, can prevent rupture, light, strong, durable and portable. You can quickly remove the air according to your needs, and eliminate the accidental over-inflation during inflation, making you more focused on diving. Over pressure valve (OPRV) for BCD, SMB, lift bag and other buoys. Attached with drawstring lanyard, easy to assemble, easy to use. Specially designed for water sports, scientific design, professional equipment, high-quality materials, comfortable and durable. Specification: Size: approx.5.2x2.7cm/2.05x1.06in Color: Black Material: ABS Package Contents: 3 x Over Pressure Release Valve Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.