2" Removeable Top Deck Drains “Feet” are located at the bottom of select drains, these feet hold the drain in place when poured concrete is used. 2” square Deck Drains are adaptable to ordinary 1.5” fittings and stands on its own feet for easy upright installation. 2” square Deck Drains have a minimal debris collection and a maximum flow rate of 32.4 gallons per minute.