Redland Dental Products Universal Cuspidor Traps are disposable filters, designed to replace the trap presently in your evacuation unit or cuspidor. They reduce the possibility of infection and contamination, while improving the performance of your evacuation system.Evacuator screens, traps and filters are used to collect solids that are suctioned into evacuation lines. These products are used to maintain evacuation systems and ensure efficiency by preventing clogs. Fits most cuspidor bowls including – Adec, Ampco, Belmont, Dabi-Atlante, Dansereau, DCI, Den-Tal-EZ, Forest, Knight, Marus, MDT, Proma, Ritter & Schein.