Go-Cal Replacent Filter Back Catalog number: 811-9917-01 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended TE-23 Teflon Bag, On-Off Valve (4.7L) Price on request 811-9901-01 Gilian Bag Sampling Kit with Jar (Use SC-1 or SC-3 Price on request 375-0003-01 Pump Carrier, Soft, Gilian 800i/5000/10i/12/GilAir Price on request