Caleffi F52429 Conical Inlet Filter for 521 Series Thermostatic Mixing Valves

The Caleffi F52429 is a genuine OEM replacement conical inlet filter designed specifically for use with Caleffi's 521 Series MixCal™ thermostatic mixing valves. This inlet strainer protects the valve's internal components by capturing sediment, debris, and particulates before they can enter the mixing valve body — helping maintain accurate temperature control and extending the service life of the valve.

Proper inlet filtration is a critical part of any thermostatic mixing valve installation. Debris entering the valve can obstruct internal passages, degrade seals, and cause erratic mixed water temperatures. The F52429 conical filter installs at the inlet port of compatible 521 Series valves to safeguard valve performance in both domestic hot water and hydronic heating applications.

Key Features:

• Genuine Caleffi OEM replacement conical inlet filter
• Designed for Caleffi 521 Series MixCal™ thermostatic mixing valves
• Also compatible with Caleffi 5213 Series TubMixer thermostatic mixing valves
• Protects internal valve components from sediment and debris
• Helps maintain stable mixed water temperature output
• Supports long-term valve performance and manufacturer warranty compliance
• Sold individually

For complete installation guidance, refer to the Caleffi 521 Series installation manual. Replacement union nuts and tailpieces are available separately — consult the current Caleffi Plumbing and Hydronics Catalog for sizing and connection style options.