Stenner (45MJH7A1S) Series 45 Feeder Systems 22 GPD; 100PSI; 120/60; 1/4" WhiteThe number-one choice of water professionals, Stenner chemical feeders are based on a simple, well-engineered design that minimizes complexity and delivers outstanding performance. The time-tested Stenner design is renowned for exceptional reliability and ease of service, which increases dependability for users while reducing service time and expense. Peristaltic pumping action makes Stenner chemical feeders completely self-priming against pressures up to 100 PSI and the 3-point roller assembly provides a positive 2-point seal on the tube. This eliminates the need for check valves and prevents siphoning. In addition, Stenner quality workmanship produces pumps that are durable and accurate to 2% at all settings.