The mouth adopts the grade silicone, odor free, the texture is soft and can prevent the masseter muscle fatigue. Under-chin exhaust system, directing to the sides. With light and unobstructed breathing naturally supple. Mechanically balanced for smooth and easy inhalation and exhalation. Applicable in recreational diving ,snorkeling, underwater production areas,underwater rescue, fisheries breeding. Description: Item type: Diving regulator Product size: 10x10x5CM Connection type: screw thread Application: pressure reducing valve, pressure regulating Applicable medium: water Weight: 354 g Usage: source is air, and is about 0.75, turn the gear to the best ( breathe freely and not air leakage ), please try to safety before launching. colour: yellow Material: silicone + brass + ABS Package Contents: 1 x Diving regulator Note: With brass connector, mouthpiece and low pressure air hose. The depth of underwater diving is not more than 30 meters Only the above package content, other products are not included. Note: Light 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.