Rechargeable Kit to Inflate the CO2 Cartridge 30mpa Hand Operated PCP Pump Inflatable Adapter for Airgun HPA Tire Paintball Tank If you have this set, you can easily charge the cartridge or tank. ---------------PCP Pump Feature: A 3-stage high pressure pump design allows you to reach 4,500 psi with less effort than other pumps, which will provide your air gun with maximum pressure. Mini Pressure Gauge ensure precesion pressure data. Non-slip handle for comfortable use. 8mm fast female thread. Suitable for automobile tires, motorcycle tires, bicycle tires, gas cylinder, etc. Specification: Product Name: PCP Pump Material: Stainless Steel Color: As Shown Pressure: 300bar (4500psi) Compression Level: 3 Stage ---------------Charging adapter and reusable cartridge Features: - Thread:3/8-24UNF and 8mm Pagoda head - Filling gas:CO2/H2 Soda ect.. - Made of stainless steel 304 - Mini Convenient/High quality and durable - Detachable design:It is convenient for disassembly and washing.Not rust - Serviceable range:Airsoft/Beer machines/Soda/Bicycle wheels/Basketball and so on. What is the grade of the steel you used? ----304 stainless steel, edible grade What are the o-ring specs? Viton, Kalrez, E38... ----Gas phase silica gel, after secondary vulcanization What is the maximum pressure 200 bar, 500 bar?? ----After the seller's own test, it can withstand 20Mpa without any damage, leakage and other abnormalities. If you are interested, please contact the seller to provide the test video.