What is the size of the male fitting that scews into my system? Thank you!

the male fitting on this vent valve is 1/8" npt. the outer diameter of the male thread is approx. 5/16" . the picture of the one i bought was quite deceiving. didn't look anything like the one i got, but it did fit.

it came with a plastic tab in the 1/8" threads,,, is that supposed to be screwed into the line

What do the instructions have to say about the tab? Anything? If you didn't receive any instructional information with the valve, then I suppose you purchased from the wrong seller because Watts typically provides some installation paperwork with their valves.

Put two of these in my upstairs which is on a separate zone from the rest of house and now the heat no longer works. Any suggestions?

I agree with GSV, Lyle, and Jake. Make sure your circulation pump is running, all zone valves are open. Do you have heat in the rest of the house? If no heat, make sure your burner is coming on. And make sure you have power to your zone valves so that they are opening. And that your air bleeder valves are a couple turns open.If all of these issues are solved, then Lyle 's suggestion may be the problem and the bleeder valve may be drawing air in instead of pushing it out.

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⚡ Elevate your system’s efficiency with the Watts0590715 Float Vent!

COMPACT DURABLE - Brass exterior finish with a sleek 1.75 x 1.75 x 2.75 inch profile fits tight spaces with style
GLYCOL READY DESIGN - Engineered for seamless use in glycol systems, ensuring versatility
HEAT RESISTANT FLOAT - High-temp polyethylene float endures up to 240°F without compromise
PRESSURE PROOF PERFORMANCE - Handles up to 150 psi for reliable operation under demanding conditions
IMPURITY RESILIENT FUNCTION - Float line stays below valve seal, maintaining flawless operation despite impurities

The Watts0590715 1/8" FV-4M1 Automatic Float Vent is a compact, brass-finished float valve designed to operate reliably at pressures up to 150 psi and temperatures up to 240°F. Its high-temperature polyethylene float and compatibility with glycol systems ensure durable, impurity-resistant performance in demanding HVAC and fluid management applications.

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Maximum Pressure	1.5E+2 Pound per Square Inch
Valve Type	Float Valve
Inlet Connection Type	National Pipe Tapered
Outlet Connection Type	FNPT
Exterior Finish	Brass
Item Dimensions	1.75 x 1.75 x 2.75 inches
Material Type	Brass

Watts FV-4M1 Automatic Air Vent Valve, 1/8 Inch, Female NPT Connections, Brass Body and Air Vent with a Silicon Rubber Seal, Polyethylene Float with Valve Plug and Automatic Vent

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