Rubber (BUNA-N) Gasket for Bell Jar, 10 inch, for SPI Vacu-Prep II, Polaron Models E6300 and E6700 | 12207-AB | SPI Supplies
Nitrile Gaskets also referred to as Buna-N rubber or Butadiene rubber
USA Sealing - Roll: Buna-N Rubber, 6" Wide, Black - 09733775 - MSC Industrial Supply
Rubber-Cal Buna-N Sheet- 0.125-in Thick x 36-in Width x 12-in Length- 60A Durometer- Black- ASTM D2000 BG in the Rubber Sheets & Rolls department at Lowes.com
Fabric Reinforced Buna-N Rubber Sheets and Strips - With Adhesive – USASealing