Mud Valves from Trumbull Industries are used in treatment plants to drain tanks for maintenance or cleaning. They provide trouble-free, low-maintenance operation. Each one receives a unique serial number stamp after passing inspection by quality assurance. In addition, they are certified for compliance with both NSF-61 and NSF-372, providing assurance that they are safe for use in a public water system. They are adaptable to specific needs with options including sliding stems and optional materials for seats, which are mechanically retained for ease of replacement. 800/677-1799; www.trumbull-mfg.com; Booth 5321.