50 * 50mm PTFE (Teflon) Back Catalog number: 8644T-50 Manufacturer: Sampling Systems Availability: In the manufacturer's stock Price on request - + Recommended 8700S-03 200mm Sieve. 1mm Price on request 8370H-200S 200mm dia Funnel box of 10 Sterile Price on request 8700B-12 200mm Sieve. 150micron Price on request