Maintains water levels using water pressure, as opposed to a lever arm and ball, as the force to close. Float is enclosed in the housing, making it ideal for "small areas". Compact, self-contained design greatly enhances reliability. Body is made of durable glass-filled nylon 6/6; internal parts are made of ABS plastic, silicon and stainless steel. Meets anti-siphon requirements. 

2 year guarantee. 

Operating limits 8-100 psi.