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Service Pack 3 for Sigma Simply Safe Thermostatic Valve

  • $360.00

Your premium thermostatic shower system contains a sophisticated thermostatic cartridge and components that over time experience wear and tear, corrosion, and build up of mineral deposits which impair their proper functioning.

To ensure continued safe and enjoyable use of your thermostatic shower system, we recommend servicing it about every 15 years. You should replace the thermostatic cartridge, volume control cartridges, and check valves.

Parts Included

  • One Sigma Simply Safe Thermostatic Cartridge 18.30.155
  • Two 3/4" German Volume Control Cartridges 18.30.011
  • Two Brass Spring Check Valves 18.30.156

Shop with Confidence

  • No sales tax except in California
  • These are quality products covered by our warranty


Usually ships the day of purchase.


  • Installation Guide
  • Replacing Thermostatic Cartridge Video
  • Highly recommended tool: 17mm socket with long handle.
  • When replacing the thermostatic cartridge, calibrate the cartridge by setting the hot and cold temperature limits (see the Installation Instructions), to protect the user while bathing.