Outdoor Camping Stove Tank Inflation Gas Cylinder Adapter MAPP Mutual Charge Isobutane/Butane Gas Adapter Gas Spray Refill A: Name: pressure relief to charge Material: 6061 aluminum and 58 copper Weight: 28g B : Material: 6061 aluminum alloy + 59 copper Specification: 2.7*2.5cm Weight: 20g C: Camping stove adapter Color: As shown. Material: Aluminum alloy. Size: As shown. Weight: 44g D: Material: alumium alloy Color: As picture shows Size: 20*20mm Weight:approx 15g1: The gas in multiple unused flat gas tanks can be collected into one gas tank through this valve to achieve the purpose of reuse. 2: This valve can be used with cassette converters, Mamp converters, liquefied gas converters, etc. to achieve mutual inflation between gas tanks, regardless of the upper and lower directions, and can be connected arbitrarily. 3: The core part of the switch uses 58 copper, which is resistant to wear and tear. 4: The gas seal uses fluoroplastic O-rings, which are resistant to wear, chemical corrosion, low temperature and high temperature, and can be used normally at -20~250 5: Double O-ring design for sealing, one to seal air and one to prevent air leakage. 6: Style 1 has the function of depressurizing and discharging air from the inflated tank. Style 2 does not support vented air.