50 * 50mm PTFE (Teflon) Back Catalog number: 8644T-50 Manufacturer: Sampling Systems Availability: In the manufacturer's stock Price on request - + Recommended 8700B-15 200mm Sieve. 90micron Price on request 8370H-200 200mm dia Funnel box of 10 Price on request 8700B-08 200mm Sieve. 425micron Price on request