They call it Coolant Bleed Ring
https://gowesty.com/products/coolant-bleed-ring-replacement-kit?_pos=65&_sid=4c2525077&_ss=r

gp

‘87 T3
‘81 R65
‘61 TR3

From: Greg McKinney
Sent: Monday, January 2, 2023 11:01 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Coolant Bleeder Link Under Engine Cover

Hoping someone can help me for the name of the part or parts.

It's the plastic tube that runs under the edge of the engine cover and
connects the coolant system to the bleeder valve at the back of the engine
compartment.  I've seen a link to a kit to replace it on here before, but I
can't remember the name to look it up.  I think it was to a page on GoWesty
or Vanagain, but need a name to look it up.

Thanks,

GregM

'90 Carat