Package of 50 Cover Plates, diameter 33mm Back Catalog number: 435028 Manufacturer: HYDRO-BIOS Availability: In the manufacturer's stock Price on request - + Recommended 438020 Plankton Net for quantitative collection with cowl Price on request 438055-001 Repair Set for Net Bucket No. 438 055 Price on request 435100 Folsom's Plankton Sample Divider Price on request