Package of 50 Cover Plates, diameter 33mm Back Catalog number: 435028 Manufacturer: HYDRO-BIOS Availability: In the manufacturer's stock Price on request - + Recommended 435023 Tubular Plankton Chamber, capacity 25ml Price on request 438030 Plankton Net for qualitative collection Price on request 438025-001 Repair Kit for Net Bucket No. 438 025, Price on request