PTFE Beaker Back Catalog number: A135-1 Manufacturer: Sampling Systems Availability: In the manufacturer's stock Price on request - + Recommended 8700B-07 200mm Sieve. 500micron Price on request 8644AB-100 100 * 100mm Borosilicate glass (pyrex) Price on request 8700B-04 200mm Sieve. 850micron Price on request