Pricing mentioned is for a PK. Requires a minimum buy of 1 PK. 7000 Series Half and Full Facepiece Accessories, Cartridge/Filter Adapter, 2/PK; Hazmat=False; Features=Allow the use of different cartridges and filters and enhance the versatility of these facepieces; StandardPack=2EA/PK; CountryOfOrigin=US; Type=Cartridge/Filter Adapter; Used With=7800S;