A separator attachment (100) for use with a vibratory apparatus (300), the attachment including a housing (110) mountable to a vibratory apparatus (300) below a material-conveying surface (304) of the vibratory apparatus, the housing (110) defining a pressure chamber (130) with an inlet and an outlet. The housing (110) has at least one wall with a wall surface having a first end disposed proximate to the outlet of the pressure chamber (130) and a second end. The attachment (100) also includes a deflector plate (170) with a deflector plate surface (172) having a first end (174) disposed proximate to the outlet of the pressure chamber (130) and a second end (176), the deflector plate surface facing the wall surface. The deflector plate (170) is translatable relative to the at least one wall to vary the spacing between the deflector plate surface and the wall surface. A system including a vibratory apparatus (300) and the attachment (100) may also be defined.