Which Albion Piston Packing (Cup) is best?
Albion manufactures a wide variety of pistons. Choose the best one for your application based on the type of material you are dispensing: #21-1 SOFT LEATHER: Low friction, tough and durable, excellent chemical resistance. Soak in motor oil to maintain. May swell then break down when used with water based materials. Oil more frequently or choose another piston below for acrylics. Add a #222-2 Expander in front of leather piston if you are experiencing leakage or blow-by. You can purchase these individually or as a complete replacement kit (leathers, washers, nuts): #47-7 is the kit with soft leather pistons, Kit #47-13 includes #222-2 expanders also. #21-7 IMPREGNATED LEATHER: Similar to soft leather piston but stiffened with wax to reduce water absorption and blow-by. #21-16 NITRILE RUBBER: Good seal, elastic, moderate friction. Excellent for water-based materials. Preferred by chinkers. Not recommended for use with solvent-based materials. For a complete replacement kit order part #47
