High Quality

Bulb & Capillary Thermostats are 100% Tested & Ambient Compensated before they leave our facility.

Made in the U.S.A.

These products are made in Eau Claire, Wisconsin, U.S.A.

Direct Customer Support

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Our Products

Original equipment manufacturers worldwide use bulb & capillary thermostat switches designed & manufactured by STEMCO, a Division of Senasys, for food equipment, HVAC and other applications.

STEMCO Capillary Tstat 351-253956
Single Stage Bulb & Capillary Thermostats
STEMCO Capillary Switch 351-254288
Two Stage Bulb & Capillary Thermostats
Electronic capillary sensor
Electronic Temperature Switch
368 Capillary Diaphragm Assembly
Hydrastat Capillary Diaphragm Assemblies
Large Silver Thermowell STEMCO Capillary Switch
Thermowells & Support


Common applications

Learn more about how our capillary thermostats are used.


Your questions, answered.


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We are always looking for our customer’s feedback. If you’d like to leave us a review to be posted online, please email us at info@senasys.com.

After calling and confirming it was indeed the part I needed, It was ordered and shipped fast, beat the ETA by a few days. It arrived as described and my customer had quicker than he anticipated, making me look good. Thank you, I will be dealing with you again.

Mike S.


Thanks so much for the speed in which I received this item. Instillation was easy and it worked immediately, the temperatures outside dipped below zero and I was able to keep warm and cozy.

Janet C.

End User

Do you sometimes have the feeling that you’re running into the same obstacles over and over again? Many of my conflicts have the same feel to them, like “Hey, I think I’ve been here before”

John Doe

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    Our office hours are

    Monday – Friday

    8 a.m. to 4 p.m. CST

    STEMCO Capillary switches

    A Division of Senasys

    1435 International Drive

    Eau Claire, WI 54701 U.S.A.

    +1 (715) 831-6353