WE just purchased a used Astoria 1 group and plumbed it in today. After leaving it running for a while I noticed a puddle under the right rear. After taking the side off I noticed it was coming from the srew ajustment on the top of the pump. Now the pump has been replace obviously to a Procon but looks in good shape.

Now I searched the forums and found a thread on this and it says that there should be a oring in the screww assemply at the top. Upon taking the screw out i found no Oring and just a spring.
My qestion is with regards to the oring is where should it sit...on top of the spring under the screw...under the spring or both?

also does anyone know what size oring this is?

Thanks Mike.

Have You looked at Espresso Parts website?

no I have not...Will do now

Just looked a recommended sit and it shows the diagram of the pump but not the breakdown of that assembly.

Now I searched the forums and found . . .

But did you go here? /downloads/ ... d_View.pdf