Features: Material: metal Package size: 58.5*11*5.5cm/23.03"*4.33" * 2.17 "High pressure gas bottle inflation: 0.5L gas bottle is about 400, about 6-7 minutes Features:< br/> Made of high quality metal, anti-rust and durable. High pressure hand air pump, with oil-water separator, compresses dry and clean air into the oxygen bottle.< br/> Easy to pump, convenient to use, saving time and labor. With a pressure gauge on it, you can know when to stop inflating. Portable and practical accessory, essential for diving. How to use: Open the folding base High pressure air pump and respirator link Rotate the air pump relief valve high pressure Start playing, when the pointer reaches 20 MPa, stop inflation Unscrew the discharge valve of the high pressure air pump Open the pneumatic cylinder and the cylinder The connection is completed Equipment: 1 x pump 1 x manual 1 x installation accessory kit Note:< br/> -Due to different producing batches, product details might be a little different. If you are concerned about the difference, please buy it carefully. -Please allow 1-3cm difference due to manual measurement. -Due to different display and light different, the picture may not reflect the actual color of the item. Thank you for your understanding.