This product is only available on www.mks.com
Buna-N O-Ring, NW40 Size ISO-KF Vacuum Flange, 2-326 O-Ring Size
The 100313905 Buna-N O-Ring is designed for use with size NW40 ISO-KF centering ring assemblies. This 2-326 size O-ring is made of black Buna-N compound N674-70 and is rated for up to 80 deg. C bakeout temperature. This Series 31 accessory offers seals easier and is less expensive than similar Viton O-rings and can be used as a spare or replacement O-ring.