Air Gap International Gap-It Kit HF1 Washing Machine Air Gap For 2" Drain Pipe Designed to fit into recessed washing machine outlet boxes w/ 2" standpipes. Also fits onto top of exposed 2 standpipes. Units feature a flow straightener to quiet and smooth out turbulent flow and splatter shields to eliminate any water droplets that may splatter out of either air gap opening. Units designed to allow space for washer drain hook or soft rubber washer hose to share standpipe with Gap-It. Multiple air gap openings exceed the code mandated minimum of at least one (1) vertical opening. For technical issues regarding this product, please call (714) 990-2300