Equivalent to Davey 43403 and WBOR100300, Onga 800879K Nitrile Rubber Casing O-Ring. Fits Davey, HS series, SJ60-08 and diffuser o-ring in Powermaster. As well as Onga JS120. If you want to find out more about rubber o-rings check out our blog Everything you need to know about rubber o-rings