MX128LF Honeywell MIXING Valve

The Honeywell MX128LF 1 1/4 in. NPT Lead-free mixing valve

Overview

The Honeywell MX128LF is a lead-free thermostatic mixing and diverting valve engineered for precise water temperature control in domestic, commercial, and industrial hot water systems. It ensures consistent mixed water temperature even under fluctuating flow and pressure conditions, while automatically reducing flow if the cold water supply is interrupted.

This 1-1/4″ NPT model from the Honeywell MX Series offers dependable performance, durable construction, and compliance with lead-free plumbing regulations.

Features

• Thermostatic mixing or diverting valve operation

• Maintains a constant mixed water temperature during variable flow or pressure

• Built-in safety function — reduces flow if cold supply fails

• Operates effectively at very low flow rates

• Tamper-evident temperature adjustment using Allen wrench

• 1-1/4″ NPT connections for easy installation

• Optional recirculation port for faster temperature balance

• Can be installed in any orientation — vertical or horizontal

• Teflon-coated internal components resist scale and mineral buildup

• Lead-free construction meeting current plumbing standards

Specifications

Applications

The Honeywell MX128LF Mixing Valve is designed for maintaining controlled water temperatures in a wide range of plumbing and heating systems, including:

• Domestic hot water systems in homes, hotels, and schools

• Commercial hot water recirculation loops

• Industrial washdown and process systems

• Centralized mixing stations in multifamily buildings

• Systems requiring lead-free, code-compliant temperature control

This valve helps ensure safe, comfortable water delivery and prevents temperature fluctuations that could cause scalding or thermal shock.

Benefits

• Provides accurate and stable outlet temperatures

• Reduces scalding risk through automatic flow control

• High flow capacity supports larger commercial systems

• Resistant to scale for extended service life

• Simple installation with NPT fittings

• Meets all major safety and plumbing standards

• Suitable for both new systems and retrofits