Features: brand new 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 for valve/ pressure relief for 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 for 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. Specifications: Material: PVC Color: Black Package Weight: approx.40g Size: approx.5.2x2.7cm/2.05x1.06in Package Includes: 1Pc x Over Pressure Release for Valve note: Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!