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# Factorio Runtime Docs Version 2.0.77

# PipeConnectionType - Runtime Docs

## PipeConnectionType :: union

#### Union members

`"normal"` | 2 connections are required to be adjacent tiles next to each other on their respective directions.
`"underground"` | Allows distant connection up to a certain limit. Those connections may be blocked by tiles.
`"linked"` | For mods, connections between entities have to be explicitly requested by script.

Concept used in

- PipeConnection
- PipeConnectionDefinition