350psi Resilient Wedge Gate Valves BrochureSource: Mueller Co.
Triple O-rings and dirt seal
A dirt seal at the top keeps out debris. Two O-rings above the stem thrust collar bearing area isolate it from ground contaminants, and one below isolates it from the waterway. The two upper O-rings and the dirt seal can easily be replaced in the line while the valve is under pressure in the fully open position.