Whenever I press shift+P while pointing at one of the underground pipes, I get the following error:

Error while running event pipelayer::pipelayer-toggle-connector-mode (ID 105)
pipelayer/Network.lua:249: attempt to index local 'connector' (a nil value)

When I place the pipes connected to a system with fluid in them, the surface pipe receives the fluid but its underground part does not. No fluid will flow through the underground.

Are you trying to change the input/output mode while selecting the underground half of the connector? Can you try it while pointing at the aboveground half? I’ll look into the error.

+. Aboveground.

And undergroud)

I think I see the problem

After last update, all work. Thanks)

Thanks for the report! Glad to hear it’s working for you now.

.

I'm trying to change via the aboveground piece. I'll give the below-ground a try, then try to update.

Update:
Trying in underground mode didn't work either.
Updating the mod fixed it. Thanks!