I ordered a size 10 last night but if its a 9 I will make another Amazon order. Here's a link to another o-ring source if you know the size needed. https://www.amazon.com/Viton-Ring-Durometer-Round-Black/dp/B0052AU2A6/ref=pd_ybh_a_8?_encoding=UTF8&refRID=TN2W4WV2ME235CMJYD40