I have a couple of main seal caps that are slightly different in size from each other.Don't all Y-blocks use the same main seal cap?One is EBU-6335-A and the other is ECG-6335-B.The ECG is slightly wider and has a larger radius than the EBU.Is one of these for a 312 and the other for 272 and 292?

 

Paul,

Boonville,MO