The Gas Rack/Water Rack (GR-14XX) regulates and controls the flow of silane, nitrogen, hydrogen, and water to and from the reactor. There are twenty gas rack/water rack assemblies in the Polyreaction Unit, one for each TDF-L Reactor. All twenty assemblies are identical. Each assembly includes all piping and instruments identified with the scope of the gas rack and water rack, as shown on the P&IDs.