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

No surprises. Worked as I expected.

Heavy duty.

Feb 2017 update: Its 2017, but I noticed that I havent had a leaking Hy-Vent since I installed a heat pump hot water heater in 2015. This means the hydronic system never fires up to provide domestic hot water during the non-heating seasons. Whereas the oil furnace used to run daily to make hot water for laundry/showers/dishes, now it only runs September to April/May for baseboard heating. I should expect the Hy-Vents to double their service life from 3 years to 6 years. Original review: I would have given it 3.5 stars if possible. It does a great job of purging air from my hydronic/baseboard heating system zones. However, I have been marking dates on them since we remodeled our house 4 years ago, and none of them are older than 3 years. The culprit is always leaking water from the top cap, and I always find that the o-ring has been deformed permanently from just 2-3 years of use (see photos of failed vent valves that Im replacing with new ones I just purchased from Amazon). I would have given it 5 stars if Taco would sell a 3-pack or 5-pack of o-rings for say $2 so I dont have to toss an entire vent when only the o-ring fails. I expect these new ones to not last past 2017. Replacing these vents at the zones is fairly straightforward with only minor water spills and leaks to collect since I have a pair of shutoff valves at each zone. The one on top of the expansion tank is the most challenging since a lot of water comes out of the tank; Im going to use another reviewers advice and install a shutoff valve the next time the expansion tank vent fails.

Used on a 30 gal hydronic buffering tank. Works perfectly. Let’s air out, keeps water in. Get it.

I liked the product fine. It is heavily built and performs the job .I cant know about unit function until heating season but, for now it is perfect.

Between a faulty auto-fill valve and air vent, my second floor radiators would become air-locked. Replaced both and now Im staying nice and warm! This is one of those preventative maintenance items you should replace every couple/few years.

After spending several days of trying to bleed all of the air out of my system using manual bleeders and having little luck, I purchased several of these and actually only had to install one of them --- on the highest/farthest radiator. Works like a charm. Except for the nylon-like valve stem body, the entire unit is very substantially made and much better built than other units of this type. And its NOT made in China!

Replaced my Maid-O-Mist, that came with my house. It was old and crusty, and I would have to press the schrader valve to let the air out periodically. I havent heard any gurgling at all this fall from the pipes. I almost want to introduce air to the system to see what happens. So far so quiet...

Direct replacement. And prime next day for the win.

Worked perfectly. Easy to install and no issues at all.