The Zehnder ComfoTube Flat 51 cross-piece is a compact cross-piece can be used to cross over two lengths of Zehnder ComfoTube Flat 51 in a height restricted space. The cross-piece comes complete with locking slides and oval O-rings.  It measures 57mm high x 343mm wide x 343mm deep.

Zehnder P/N 990 322 154