I think I have read all or at least most of the Holley 94 info here, Dreddybear has a really nice post in the Holley 94 group with a huge compilation of links. I can not find any info on this part, what it does or why. I will link this to the 94 group, seems to be little traffic there now. This part is in the bowl of an 8BA in addition to the part in the bowl the sprayer was also replaced with the part in picture number 2. I removed the second part added a check/needle and a sprayer.. Not sure what to do with the other one. under the screw is a check ball, the whole part is only held in with magic!!