Restore like-new performance to your fixture with this replacement part — Sigma 18.30.218 Thermostatic Extension Set (2). For Sigma. Designed as an OEM-style replacement for Sigma, it's precision-engineered for an exact fit and long service life, installing cleanly with no modifications to bring back smooth, reliable operation.
Sigma 18.30.218 THERMOSTATIC EXTENSION SET INCLUDES (2) VOLUME CONTROL STEM EXTENSION
The Plumbing Part Doctor specializes in hard-to-find replacement parts for luxury showers, tubs and faucets — helping you repair the fixture you have instead of replacing the whole system. All parts ship from our U.S. warehouse with flat-rate standard and overnight options. Need help confirming compatibility? Our parts specialists are just a call away.