Moen S3371, 3/4" IPS Connection with Check Stops Thermostatic, ExactTemp Collection

Details

Model: S3371
Manufacturer: Moen
Product Name: ExactTemp® Thermostatic Rough-In Valve
Part Number: 1845122
Description: 3/4-inch IPS connection thermostatic valve, vertical spa configuration, brass construction, ExactTemp® temperature control system.

Product Overview

The Moen S3371 ExactTemp® Thermostatic Rough-In Valve is a precision-engineered control assembly designed for professional installation in vertical spa and high-flow shower systems. Constructed from solid brass for mechanical strength and corrosion resistance, the valve delivers accurate temperature regulation and consistent flow under varying supply pressures. The ExactTemp® technology maintains temperature stability within ±1°F, providing precise thermal control for multiple shower outlets. The valve is designed for integration with Moen ExactTemp® trim kits and supports high-volume water delivery for multi-function shower configurations in both residential and commercial applications.

Technical Specifications

• Manufacturer Part Number: S3371
• Alternate Part Number: 1845122
• Valve Type: Thermostatic Rough-In Valve
• System: ExactTemp® Thermostatic Control
• Inlet/Outlet Connection: 3/4-inch IPS (Iron Pipe Size)
• Flow Rate: 18 GPM at 60 PSI
• Design Application: Vertical spa and multi-outlet shower systems
• Temperature Range: Factory-calibrated to maintain 105°F nominal outlet temperature
• Temperature Stability: ±1°F under typical supply conditions
• Control Type: Thermostatic mixing mechanism with mechanical limit stop
• Material Construction: Solid brass body and cartridge housing
• Trim Compatibility: Compatible with Moen ExactTemp® trims (various collections, including Icon)
• Trim Diameter: 5-7/8 inches (nominal)
• Handle Type: Lever-type temperature control handle (trim-dependent)
• Cartridge Type: ExactTemp® thermostatic cartridge assembly
• Pressure Rating: 125 PSI maximum
• Installation Orientation: Vertical
• Mounting Method: Behind-the-wall installation within stud cavity
• Operating Environment: Indoor, wet location (shower/spa rated)
• Compliance: Meets ASSE 1016/ASME A112.18.1/CSA B125.1 for thermostatic mixing valves
• Finish: Rough brass (intended for trim cover interface)

Installation Notes

• Install per Moen ExactTemp® system layout; maintain minimum inlet and outlet clearances for service access.
• Flush supply lines prior to installation to prevent debris intrusion.
• Verify correct orientation of hot and cold water inlets per valve marking.
• Use only Moen-approved trims and cartridges for proper temperature calibration.
• Pressure test system prior to closing wall; ensure no leakage from body joints or connections.
• Allow for service access to cartridge assembly for future maintenance or replacement.

Summary

The Moen S3371 ExactTemp® 3/4-inch IPS Thermostatic Rough-In Valve is a high-flow, solid brass control valve designed for precision temperature regulation in multi-outlet shower and spa installations. Featuring ExactTemp® thermostatic control technology and rated for 18 GPM at 60 PSI, it provides stable water temperature and performance reliability for professional-grade plumbing applications requiring high-volume delivery and precise temperature management.