Gate Valves S11 This 20” filter housing is

This 20” filter housing is NSF listed and doubles the flow rate of the 10” housings (10 to 12 gpm)

flex open with air pressure and close when air is stopped

A Robust Aire™ energy efficient compressor injects air to the bottom of your pond with weighted

blue green algae and muck

22 galvanized center supports

Gate Valves S11 This 20” filter housing isKnife gate valves are economical quick acting valves for low pressure applications. They can be easily taken apart and the seals can be changed; even the valve body can be changed without upsetting the ends that may be glued to your pipes. They offer unrestricted flow and are quick opening, 100% water tested at the factory and quite low in cost. These 1. 5 to 8 valves are all PVC with stainless steel shafts, polypropylene knife gates (except for 4, 6