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Help connecting Radiant Roll to manifold

GDBX Member Posts: 2
Hi I have old (1989) Radiant Roll EPDM staple radiant floor by defunct Bio-Energy Systems that sprang a leak at manifold. EPDM tubing is in good shape, no known flow issues.
The tube and teflon? 3/4" long insert have come apart from the manifold. With no instructions on how to reinsert. How far should the teflon insert go into the tubing?
This seems to be just a pressure fit into the manifold but cannot get tube with teflon in far enough to stop leaking. How far should tube be inserted into manifold? From what I read you should be able to insert by hand. Any help would be appreciated.

I believe Radiant Roll similar to SolaRoll if that helps.
Please see picture and documentation that I have on it.