Polytechnic Resources, Inc STD & Elliptical Filters For Morgan, New Morgan, Medisoft (Different Versions) (Bx/100) 100780E2 Small Elliptical Filter, Morgan 100780EW Elliptical Filter, Morgan 100780K Morgan Filter with Mouthpiece 100780NKNW Kit - Morgan Scientific Filter, Disposable Mouthpiece, Nose Clip 100780W Morgan Filter 100790E2 Small Elliptical Filter, Fite Medisoft, New Morgan 100790EL Elliptical Filter w/Lip, Fite Medisoft, New Morgan 100790EW Elliptical Filter, Fits...