The IC/FP Interchangeable Cartridge Freeze Protection Valve is installed into the lowest point within the heated system. The thermal actuator is tee’d into the NPT threaded opening with adequate internal clearance to monitor the water temperature. When the water temperature drops below the valve’s set point, typically 35°F (1.7°C), the thermal actuator modulates the valve open.

Once the makeup water temperature returns to the safe range (5 degrees above the open set point, typically 40°F [4.4°C] ), the valve then modulates closed, minimizing water waste. Due to the sensing element, the thermal actuator, always being wetted this valve is unaffected by ambient air temperature and opens only when the water is in danger of freezing.

Typical Applications

ICFP Freeze Protection Installation

Relying on having to manually open valves for freeze protection allows for human error or plugging of partially cracked valves. This annually accounts for large amounts of freeze damage resulting in huge monetary losses including repairing damaged equipment and piping, as well as system downtime.

The self-actuating IC/FP cartridge freeze protection valve eliminates the human errors associated with manual valves.

The automatic IC/FP valve is ideal for the protection of piping, safety showers, solar collectors & piping, condensate systems, fire lines, spray nozzles, or as backup protection on traced systems. Its sensitivity to water temperature makes this valve ideal for applications where water conservation or wastewater disposal are a prime concern.

Design Features

  • Exclusive self-actuating Thermoloid® blend paraffin wax actuator
  • Corrosion-resistant
  • Narrow temperature band
  • Compact and low mass
  • Brass or stainless-steel body, fittings, & plugs
  • Two wrench flats for easy installation
  • Ram-type plug for reliable shutoff


  • Self-operating – no external power source required
  • Protects against freeze damage
  • Primary protection or fail-safe backup
  • Long service life
  • Fast response
  • Discharges minimum amount of water required




180 - 000000 - 035

1/2” IC/FP-35 Cartridge1

180 - 000000 - 039

1/2” IC/FP-39 Cartridge1

180 - 110000 - 035

1/2” IC/FP-35 SS Cartridge1

180 - 110000 - 039

1/2” IC/FP-39 SS Cartridge1

185 - 000000 - 035

3/4” IC/FP Cartridge1

185 - 110000 - 035

3/4” IC/FP Cartridge 316 SS1

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3/4” IC/FP Cartridge 303 SS1


  1. Full open/close temperatures: 35°F (1.7°C)/40°F (4.4°C); 39°F (3.9°C)/45°F (7.2°C) – Other temperatures available upon request – consult with our team.


  • Sizes: ½”, ¾”
  • Maximum Operating Pressure for ½”: 150 PSIG (10.3 BAR)
  • Maximum Operating Pressure for ¾”: 100 PSIG (6.9 BAR)
  • Maximum Temperature: 300°F (149°C)


IC/FP Product Sheet
IC/FP Installation and Maintenance Instructions