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 811-0920-01 Replacement Valve Caps (Pack of 2) Price on request 800518 Low Flow Module, Blue, GilAir-3/GilAir-5 Constant Price on request 800450 Soap Solution, Flow Cell (8 oz.), Gilibrator/Gilib Price on request