M&M has built a reputation on valves that contains the reliable and patented Canister Guard™. As an oilfield product, the Canister Guard™ is unique. Its modular construction, reliability, and fail-safe assembly features make it an incomparable industry product. No special tool or equipment is needed for easy field or shop disassembly and reassembly. Main sealing components are self contained and pretested to assure accuracy and complete integrity.