Go-Cal Replacent Battery Pack Back Catalog number: 811-9917-03 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended GF25120 Filter, MCE 1.2µm 25mm, 100/Pack Price on request 811-0940-01-R Inlet Filter Replacement Housing for GilAir Plus Price on request 6075-0410-25 SCR-PHIL PAN-HD4-40 X 5/8 (Sold in pack of 25) Price on request