1 Arm-Evac 500 Pre-Filter The Pre-Filter is a lower efficiency particle filter that is used to protect the primary filter from large particles, extending the life of the primary filter. Arm-Evac 500 Pre-Filter P/N 8883-0145-P5 Price $155.00 Quantity Add to cart Find a Distributor Inquiry Overview Works With Compatible Products Works With Arm-Evac 500 Carbon Filter 8883-0956-p1 Arm-Evac 500 HEPA Filter 8883-0965-p1