The most versatile and complete solution for Aerated Koi Pond Bottom Drains! The Koi Toilet I Aerated 3" Bottom Drain features a 9" Air Diffuser with built in Triple-check valve design prevents entry of liquid/solids into air feed piping for low maintenance operation and a 3" diameter pipe. Excellent build quality, Built to last! A 4" version is also available.

• Integrated 9" Air Diffuser with built in Triple-check valve design prevents entry of liquid/solids into air feed piping for low maintenance operation
• Sweep bottom design to eliminate trapping debris.
• Threaded center column for easy installation and maintenance.
• Wide and thick flange for better liner grip.
• Full 4" height over horizontal discharge pipe.