TM 55-1930-209-14&P-19 Table 3-2.  ROWPU System Valves (Continued) Label Identification Type Valve Location and Valve Function 3/4-in. RO9 ROWPU space - on end PRODUCT WATER SAMPLING; 2-way of each pressure tube for sampling product water ball valve in RO block pressure tube 4-in. RO10 Void 2 starboard - MEMBRANE CLEANING gate valve above seawater pump SOLUTION RECIRCULATION; allows membrane cleaning solution to recirculate through seawater pumps 3-in. RO11 ROWPU space - in CARTRIDGE FILTER TO HIGH gate valve HP pump suction line PRESSURE PUMP; allows filtered seawater from cartridge filter assembly to flow to HP pump Label Identification 3-in. R012 ROWPU space - in- BRINE TO OVERBOARD gate valve board of pretreatment DISCHARGE; allows brine to skid flow overboard from RO block when making product water 3/4 in. RO13 ROWPU space - near MEMBRANE CLEANING 2-way membrane cleaning SOLUTION RETURN; allows flow ball valve solution drum of membrane cleaning solution back to drum 3/4-in. RO14 ROWPU space - near MEMBRANE CLEANING 2-way membrane cleaning SOLUTION INPUT; allows ball valve solution drum membrane cleaning solution to flow from drum 3-in. RO15 ROWPU space - between PRODUCT WATER TO STORAGE gate valve RO block and TANKS; allows product water HP pump from RO block to flow to drinking water storage tank 3-in. RO16 ROWPU space - between HIGH PRESSURE PUMP BYPASS; gate valve RO block and HP pump allows flow of membrane cleaning solution to RO block bypassing HP pumps 1/4-in. RO17 ROWPU space - in BRINE SAMPLING; for 2-way brine discharge piping taking samples of brine ball valve near valve RO7 output from RO block 3-in. RO18 ROWPU space - in SEAWATER TO ROWPU; gate valve pretreatment skid allows flow of seawater to seawater input piping ROWPU pretreatment skid 3-4