Section 35

Every ball tap or float-operated valve fitted to a storage cistern or a flushing cistern shall be securely rigidly fixed thereto above the waterline, and shall be supported independently of the inlet pipe (unless such inlet pipe is itself rigid and rigidly fixed to the cistern), in such a position that no part of the body of the tap or valve will be submerged when the cistern is charged to its overflowing level.

Circumstances in which air hole required in outlet chambers of tap.