Many specialized oilfield equipment manufacturers, primarily from China (like .,, Tianjin Dongrui Petroleum Machinery Co., Ltd.,, ,), along with established brands like Hydril (now part of NOV), (whose MSP diverters are common), and specialized suppliers like Worldwide Oilfield Machine Inc. (WOM), and Wellserv International,, produce 29 1/2-inch, 500 PSI diverters, which are large annular blowout preventers for well control during drilling operations. You can find new and remanufactured units from various global suppliers specializing in oil & gas wellhead equipment.
Key Manufacturers & Suppliers
Chinese Manufacturers: Tianjin Dongrui,(often produce API-compliant models like the MSP series).
Original/Established Brands: Hydril (MSP model is very common), often available through service companies like Patterson Services.