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Watts-FSRO40 Flexwave Steel Tank for RO Storage, 21 IN x 36.25 IN, 44 Gallon Capacity, 1 1/4 IN NPT

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Watts-FSRO40 Flexwave Steel Tank for RO Storage, 21 IN x 36.25 IN, 44 Gallon Capacity, 1 1/4 IN NPT

The Watts FSRO40 Flexwave steel tank delivers 44 gallons of pressurized reverse osmosis water storage for commercial and high-demand residential applications. Engineered with a patented oversize diaphragm that stores 20-30% more water than conventional tanks, this unit is built for systems requiring robust pressure differentials and reliable long-term performance.
SPECIFICATIONS

Watts FSRO40 Flexwave Tank Technical Details

Model Number Watts FSRO40
Capacity 44 Gallons
Dimensions 21 IN diameter x 36.25 IN height
Connection Size 1 1/4 IN NPT (stainless steel)
Maximum Working Pressure 125 PSI
Diaphragm Material 100% Butyl (oversized, patented design)
Tank Construction Cold-rolled steel, precision welded
Coating Resin primer with electrostatic polyurethane paint
INSTALLATION & USE

Installing the FSRO40 Storage Tank

  1. Position the tank vertically on a level surface capable of supporting 400+ lbs when full. Ensure adequate clearance around the 1 1/4 IN NPT connection at the top for plumbing access.
  2. Connect the stainless steel water inlet to your RO system output using appropriate NPT fittings and thread sealant rated for potable water. Verify all connections are secure and leak-free.
  3. Pre-charge the tank to the recommended air pressure (typically 5-7 PSI below your system's operating pressure) using the air valve before filling. Consult your RO system manual for specific pre-charge settings.
  4. Open the supply valve slowly and allow the tank to fill. Monitor for leaks at all connections during the initial fill cycle and verify proper pressure differential operation.
  5. Test the system under normal operating conditions. The Flexwave diaphragm should deliver consistent pressure and flow without waterlogging or air loss over time.
COMPATIBILITY

System Requirements

The Watts FSRO40 is designed for reverse osmosis accumulator systems requiring large-volume storage with sustained pressure delivery. Best suited for commercial installations, light industrial applications, or residential systems serving multiple points of use. The 1 1/4 IN NPT connection accommodates high-flow RO systems producing 100+ gallons per day. Compatible with all major RO brands including Watts, Pentair, and Hydronix. Verify your system's maximum output pressure does not exceed 125 PSI and that installation space can accommodate the 21 IN x 36.25 IN footprint.

🔧 Pro Tip: Check and adjust the air pre-charge annually using a standard tire pressure gauge. Proper pre-charge maintains the pressure differential that keeps the butyl diaphragm functioning efficiently and prevents premature tank failure from over-expansion.
The Watts FSRO40 Flexwave steel tank delivers 44 gallons of pressurized reverse osmosis water storage for commercial and high-demand residential applications. Engineered with a patented oversize diaphragm that stores 20-30% more water than conventional tanks, this unit is built for systems requiring robust pressure differentials and reliable long-term performance.
SPECIFICATIONS

Watts FSRO40 Flexwave Tank Technical Details

Model Number Watts FSRO40
Capacity 44 Gallons
Dimensions 21 IN diameter x 36.25 IN height
Connection Size 1 1/4 IN NPT (stainless steel)
Maximum Working Pressure 125 PSI
Diaphragm Material 100% Butyl (oversized, patented design)
Tank Construction Cold-rolled steel, precision welded
Coating Resin primer with electrostatic polyurethane paint
INSTALLATION & USE

Installing the FSRO40 Storage Tank

  1. Position the tank vertically on a level surface capable of supporting 400+ lbs when full. Ensure adequate clearance around the 1 1/4 IN NPT connection at the top for plumbing access.
  2. Connect the stainless steel water inlet to your RO system output using appropriate NPT fittings and thread sealant rated for potable water. Verify all connections are secure and leak-free.
  3. Pre-charge the tank to the recommended air pressure (typically 5-7 PSI below your system's operating pressure) using the air valve before filling. Consult your RO system manual for specific pre-charge settings.
  4. Open the supply valve slowly and allow the tank to fill. Monitor for leaks at all connections during the initial fill cycle and verify proper pressure differential operation.
  5. Test the system under normal operating conditions. The Flexwave diaphragm should deliver consistent pressure and flow without waterlogging or air loss over time.
COMPATIBILITY

System Requirements

The Watts FSRO40 is designed for reverse osmosis accumulator systems requiring large-volume storage with sustained pressure delivery. Best suited for commercial installations, light industrial applications, or residential systems serving multiple points of use. The 1 1/4 IN NPT connection accommodates high-flow RO systems producing 100+ gallons per day. Compatible with all major RO brands including Watts, Pentair, and Hydronix. Verify your system's maximum output pressure does not exceed 125 PSI and that installation space can accommodate the 21 IN x 36.25 IN footprint.

🔧 Pro Tip: Check and adjust the air pre-charge annually using a standard tire pressure gauge. Proper pre-charge maintains the pressure differential that keeps the butyl diaphragm functioning efficiently and prevents premature tank failure from over-expansion.
$1,606.36
Watts-FSRO40 Flexwave Steel Tank for RO Storage, 21 IN x 36.25 IN, 44 Gallon Capacity, 1 1/4 IN NPT
$1,606.36

Description

The Watts FSRO40 Flexwave steel tank delivers 44 gallons of pressurized reverse osmosis water storage for commercial and high-demand residential applications. Engineered with a patented oversize diaphragm that stores 20-30% more water than conventional tanks, this unit is built for systems requiring robust pressure differentials and reliable long-term performance.
SPECIFICATIONS

Watts FSRO40 Flexwave Tank Technical Details

Model Number Watts FSRO40
Capacity 44 Gallons
Dimensions 21 IN diameter x 36.25 IN height
Connection Size 1 1/4 IN NPT (stainless steel)
Maximum Working Pressure 125 PSI
Diaphragm Material 100% Butyl (oversized, patented design)
Tank Construction Cold-rolled steel, precision welded
Coating Resin primer with electrostatic polyurethane paint
INSTALLATION & USE

Installing the FSRO40 Storage Tank

  1. Position the tank vertically on a level surface capable of supporting 400+ lbs when full. Ensure adequate clearance around the 1 1/4 IN NPT connection at the top for plumbing access.
  2. Connect the stainless steel water inlet to your RO system output using appropriate NPT fittings and thread sealant rated for potable water. Verify all connections are secure and leak-free.
  3. Pre-charge the tank to the recommended air pressure (typically 5-7 PSI below your system's operating pressure) using the air valve before filling. Consult your RO system manual for specific pre-charge settings.
  4. Open the supply valve slowly and allow the tank to fill. Monitor for leaks at all connections during the initial fill cycle and verify proper pressure differential operation.
  5. Test the system under normal operating conditions. The Flexwave diaphragm should deliver consistent pressure and flow without waterlogging or air loss over time.
COMPATIBILITY

System Requirements

The Watts FSRO40 is designed for reverse osmosis accumulator systems requiring large-volume storage with sustained pressure delivery. Best suited for commercial installations, light industrial applications, or residential systems serving multiple points of use. The 1 1/4 IN NPT connection accommodates high-flow RO systems producing 100+ gallons per day. Compatible with all major RO brands including Watts, Pentair, and Hydronix. Verify your system's maximum output pressure does not exceed 125 PSI and that installation space can accommodate the 21 IN x 36.25 IN footprint.

🔧 Pro Tip: Check and adjust the air pre-charge annually using a standard tire pressure gauge. Proper pre-charge maintains the pressure differential that keeps the butyl diaphragm functioning efficiently and prevents premature tank failure from over-expansion.
Watts-FSRO40 Flexwave Steel Tank for RO Storage, 21 IN x 36.25 IN, 44 Gallon Capacity, 1 1/4 IN NPT | Isopure Water