328 intake manifold small vent lines

Hello F-chat,
I'm cleaning up my intake manifold (plenum riser?) on my 89 328. Question is related to the 8 small black rubber lines on the underside of the manifold (pictured).

1) The 8 small lines are supple and in good shape, should I replace them anyway?

2) when removing the small rubber lines, I cant tell if they are glued or otherwise sealed to the metal nipples? If yes, does anyone know what type of sealant to use here?

Thanks a ton!
-Mike
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Hello there, I didn't get any replies to these questions, so for posterity sake I'll mention that I put a small dab of 1211 silicone on each of the brass nipples and then just reattached the rubber hoses. Seems to be working.
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