OpTB™ Trunnion Mounted Ball Valve - The OpTB Trunnion Mounted Ball Valve is available in full and reduced port. This API 607 Fire Safe Ball Valve is a proven, rugged design. This is an ideal valve for on/off natural gas applications – and is available in a traditional three-piece body as well as a top-entry version. Metal & Soft Seating Available Standard ISO Shaft and Mounting Pad compatible with multiple types of actuators Conforms to API 6D and API 607