As an onanist myself I can tell you that 'plumbed in' is not quite the right term!
Surely the pipes are lead soldered at the joints? In which case, plumbed is exactly the right word.
@gbj_tester started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Surely the pipes are lead soldered at the joints? In which case, plumbed is exactly the right word.