• Cast brass body, washer less 47 mm ceramic disc valve cartridge with volume and temperature control, back-to-back capability, integrated check valves, and hot limit safety stop pressure
  • Valve only; trim sold separately
  • Pressure balance mixing valve with volume control and integral hot limit safety stop
  • Cast brass valve body
  • Ceramic disc valve cartridge
  • Pressure balancing valve cartridge maintains constant output temperature in response to changes in relative hot and cold supply pressure
  • Hot and cold can be reversed quickly and easily
  • Limits the amount of hot water allowed to mix with cold
  • Plaster guard is designed to protect valve during installation and serve as a mounting plate for thin-wall installations
  • Wide rough-in range: 1-5/8" to 3-1/4"

American Standard 1/2 in. Copper Sweat and NPT Pressure Balancing Valve


Manufacturer Part #: R121

Valve Size:

1/2 in


ADA Compliant
ASSE Standards
ASSE 1016
Brand Model Compatibility
American Standard Colony Soft, American Standard Green Tea, American Standard Moments, American Standard Portsmouth, American Standard Princeton, American Standard Quentin, American Standard Reliant 3, American Standard Seva, American Standard Studio, American Standard Town Square,
CSA Certified
CSA B125
Cartridge Type
Ceramic Disc
End Connection 2
Copper Sweat, NPT
End Connection 3
Copper Sweat, NPT
End Connection 4
Copper Sweat, NPT
End Connections
Copper Sweat;NPT
Faucet Connection Size
1/2 in
4-1/6 in
IAPMO Listed
Number of Handles
Single Handle
Valve Type
Tub & Shower Rough-In Valve
4-1/6 in