1/4" FV-4M1 Auto Air Vent Zoom

1/4" FV-4M1 Auto Air Vent


Brand: Watts

Qty Price
/ each
$63.50 / box (10 units x $6.35)
In Stock! Ships in 24-48 Hours
(99 Available)



Size: 1/4"
System Type: Hydronic (Water)
Min Temp (F): 33°F
Temperature Range (F): 33°-240°F
Max Temp (F): 240°F
Max Pressure: 150 psi
Min Pressure (PSI): 1.45 psi
Material: Brass
Mount: Straight
Adjustability: Non-Adjustable
Thread Type: Male
Thread Size: 1/4"

Description for Watts 0590716

Series FV-4 Automatic Vent Valves are used in commercial and residential hydronic heating applications to provide automatic air venting for hot or cold water distribution systems. It consists of a brass body construction with female NPT connection, brass cover, air vent with silicone rubber seal, polyethylene float with valve plug, and automatic vent. Series FV-4M1 has a high temperature rating and is ideal for use with glycol systems or for use as an anti-vacuum device. It can also be installed to permit the separation and dispersal of air while fluid is circulating in the system. Can be disassembled for inspection and cleaning. Maximum Pressure: 150psi (10 bar).

1/4" FV-4M1 Auto Air Vent


by PowerReviews
Watts1/4" FV-4M1 Auto Air Vent

(based on 1 review)

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Reviewed by 1 customer

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By amc1973

from Woodbridge, Virginia

Verified Buyer

Comments about Watts 1/4" FV-4M1 Auto Air Vent:

Though we needed a 1/8" but a simple nipple did the trick and it works perfectly.
Pex shipped quickly once I reminded them that it should have been shipped a day earlier as they had promised me at the time of the sale. Wonderful people to work with and I certainly would buy it again from them.

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1 Question | 3 Answers
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  • Q:

    What is the adjustable screw device on the top and what is it used for?
    Asked on 9/9/2013 by Phil from Visalia, ca

    3 answers



      That is the air vent. In normal operation the vent is left open 1 to 2
      turns, but if you need to keep air out for servicing some part of the system
      or a pressure test (of the float/vent) you can close this

      Answered on 9/12/2013 by Anonymous


      It's the vent for air to come out.

      Answered on 9/11/2013 by Anonymous


      The screw device on the top regulates the amount of air to be released from the air vent.  Just like a bleeder valve.  The instructions should have the correct setting labeled.  (For example, tighten screw and then back off 1 1/2 turn for proper setting)

      Answered on 9/11/2013 by Anonymous
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