a diffuser adapted to dissipate air from seed conveyed in a stream of air at a planter to an opener arm and seed boot . the diffuser provides a housing that pivotally supports a counter - weighted valve piece and a resilient valve piece . admitted seeds are resiliently deflected between the valve pieces . repeated deflections between the dual valve pieces and simultaneous venting of the conveying air through an associated fulcrum screen and relief ports at the housing dissipate the conveying air . spent seed momentarily collects on a surface inside the housing and gravitationally falls from the housing and through a lower lying seed boot at a relatively uniform , singulated rate without scatter and damage to the seed .