Filter, Support Pads, Porous Plastic, 37mm, 20.0µm Back Catalog number: GPP3700 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 385-0117-01 Tri-pod mounting bracket for Nephelometer (Tri-pod Price on request 800485-111-01 GilAir-3 R Pump, No Battery Price on request 6075-0410-25 SCR-PHIL PAN-HD4-40 X 5/8 (Sold in pack of 25) Price on request