Blocking the pipes.

[CrunchyBullettin]

take pipe, take metal sheet. Use metal sheet on pipe, click on it with a welder. Each time a traitor sends someone down the drain, he will be able to call for help. Other uses may include; throwing a pipebomb down the disposal and making it stealthily arrive to your desired location, while being in your office, sending guns under a floortile in escape and swiftly unpacking them when needed.