Durable Material: The pressure relief valve is made of premium brass, which is durable, not easy to deform. Professional: 3/8inch: First stage low pressure diving port plug 2; 7/16inch: High pressure regulator port plug. With Ring: The pressure relief valve comes with an o-shape ring, which is leakproof and practical. Replacement: The pressure relief valve is a great replacement part, so you can replace it directly. : The pressure relief valve is compact and , which is portable and convenient to carry. Corrosion Resistant: The pressure relief valve is corrosion resistant, so you can use it for a long time. Colour:silver Material:Metal Package Contents: 1 x Diving adapter 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.