The mouth adopts the grade silicone, odor free, the texture is soft and can prevent the masseter muscle fatigue.Under-chin exhaust system, directing bubbles 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 regulatorProduct size: 10x10x5CMConnection type: screw threadApplication: pressure reducing valve, pressure regulatingApplicable medium: waterWeight: 354 g/pcsUsage: Air supply source is air, and is about 0.75, turn the gear to the best ( breathe freely and not air leakage ), please try to ensure safety before launching.colour: yellowMaterial: silicone + brass + ABSPackage Contents:2 x Diving regulatorNote:With brass connector, mouthpiece and low pressure air hose. The depth of underwater diving is not more than 30 metersOnly the above package content, other products are not included.Note: Light shooting 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.