there's 2 little O rings that are located deep in the wells in the phenolic bowl. Be sure & take them out when you clean the bowl & I'm sure there's new ones in the kit. I always make a note of current settings (float/pump etc) as I tear one (any type) down just for a good reference point since settings dont change just cuz a carb needs cleaning/rebuilt & if a setting doesn't match up to what's on the white sheet then I have to checkout where the mistake is. I lube all screws going into the body especially on carbs where I will be opening them up frequently for rod/jet changes etc