Taco 400-4 1/8-Inch-NPT Float Air Hy-Vent

Very high quality. Easy to install. Huge difference comparing to the old fashion air vents. My appliance is very low pressure (12 psi - water-based home heating system), and air vents often do not work, but this one does the job perfectly.

easy to replace

Works very well. Ordered as a replacement for Bell & Gossett valve previously ordered and returned that leaked. Heating system is now far quieter than it has been in several years.

Ive tried Watts, coin vents, some other generic type, but this one has been the best. The knob on top feels functional, like a small turn does make a difference. On air vents like Watts, theres a lot of play in the knob and you dont get a good feel of how open it is. Also, with Watts Ive had water leaking out, and have never had that with Taco. I cant see myself buying any other vents than these. I took a star off because it was packaged horribly and arrived pretty crushed. My understanding is that the inner components, although not fragile, shouldnt be carelessly abused. There was no care in packaging at all. The Taco packaging was placed in an envelope when it absolutely needs a box for protection.

Stopped the splashing of hot water through the previous air vent (open pipe) on an atmospheric pressure, gravity fed solar water heating system. Hope it lasts for many years to come.

Perfect replacement

Seems to be a good Vent for my boiler and still working today !

Exact replacement that the manual called for. Hope to get another 28 yrs out of it like the old one.

Installed easy and works as it is supposed to.

Perfect replacement the old one that was bad.