PRESERVINO PWS-G ARGON CARTRIDGE, Set of 8 Preservino Pws-G Argon Cartridge Brand: Preservino PVOPWSG Includes 4 Argon Gas Cartridges For Use With All Of Preservino/Pek's Wine Preservation Systems Each Cartridge Contains High Purity Argon Gas-The Same Gas Used By The Finest Winemakers