What is the name of the (broken) thing in Ringworld that transports people through

What is the name of the (broken) thing in Ringworld that transports people through the ring wall? You know, the osmosis generator?

Cziltang Brone?

Exactly – except that the Puppeteer (not sure whether it’s Nessus or the Hindmost who says it) speculates that “brone” may be an [expletive not deleted].