Model AP-20S Gas Detection Pump Kit Back Catalog number: 830-0001-01 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 800303 Valve Plate Assembly, Bottom, GilAir-3 Price on request 811-0920-01 Replacement Valve Caps (Pack of 2) Price on request 811-9929-01 Inhalable Dust Sampler, GSP-3.5 Conical Style Price on request