110MM/4” SUBAIR AERATED BOTTOM DRAIN SYSTEM KOI FISH POND PUMP FILTER TANK PIPE

AQUA SURE Subair Aerated Bottom Drain System. beneaththe pond’s foundation, via the Subair sump drain. No Visible Hoses: Originating from established bottom drain and aerator steeple designs, the Subair incorporates a separate 3/8″ air connection.

eBay