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

by Taco
4.5 out of 5 stars 44 customer reviews
| 6 answered questions

List Price: $36.50
Price: $13.50 & FREE Shipping on orders over $49. Details
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  • Sturdy Brass Construction
  • Maximum Pressure 150 psi
  • Maximum Temperature 240F
  • Designed for use on hot water radiators, baseboards, convectors, radiant panels, and small unit heaters with a maximum working pressure of 150 psi
  • The Taco 400 HY-Vent can be opened (top is threaded on) and cleaned.
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Frequently Bought Together

  • Taco 400-4 1/8-Inch-NPT Float Air Hy-Vent New
  • +
  • AMTROL EX-30 30 Extrol Expansion Tank
  • +
  • Apollo Valve 10-400 Series Bronze Safety Relief Valve, ASME Hot Water, 30 psi Set Pressure, 3/4" NPT Male x Female
Total price: $63.64
Buy the selected items together


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Product Information

Size:Glossy Exclusive Paper
Product Dimensions 2 x 2 x 3.2 inches
Item Weight 1.6 ounces
Shipping Weight 1.6 ounces (View shipping rates and policies)
Manufacturer Taco
ASIN B003QSJLL2
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Origin China
Item model number 400-4
Customer Reviews
4.5 out of 5 stars 44 customer reviews

4.5 out of 5 stars
Best Sellers Rank #1,112 in Home and Kitchen (See Top 100 in Home and Kitchen)
#17 in Home Improvement > Rough Plumbing > Water Pumps, Parts & Accessories > Pump Accessories
#31 in Industrial & Scientific > Hydraulics, Pneumatics & Plumbing > Pumps
#64 in Sports & Outdoors > Sports & Fitness > Boating & Sailing > Boating > Boat Plumbing

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Customer Reviews

Top Customer Reviews

Size: Glossy Exclusive Paper Verified Purchase
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 I'm 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 don't 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; I'm going to use another reviewer's advice and install a shutoff valve the next time the expansion tank vent fails.
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The first one they sent me was the version that's two generations old, with a more complex mechanism inside that has reliability problems. Even though I installed it carefully and bought the pressure (12psi) up very gradually by pumping up the expansion tank with a bike pump, it leaked water out the vent hole continuously. The vendor (Standard Plumbing Supply) replaced it with the latest version at no charge, no questions asked. Gotta love 'em.
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Size: Glossy Exclusive Paper Verified Purchase
I ordered this air vent to replace our old Maid-O-Mist vent, which has started to leak water and was heavily covered by mineral deposits. The product arrived exactly as shown on photo, its build quality is excellent, well worth its price and should last many, many more years.
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Size: Glossy Exclusive Paper Verified Purchase
Between a faulty auto-fill valve and air vent, my second floor radiators would become air-locked. Replaced both and now I'm staying nice and warm! This is one of those preventative maintenance items you should replace every couple/few years.
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Size: Glossy Exclusive Paper Verified Purchase
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 haven't 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...
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I don’t even know where to begin with my review of these air vents, but they are quite possibly the worst purchase I have ever made in my entire life.

In late September of 2014 I purchased 10 of these vents to replace all of the old ones on my system. I was replacing the old ones because of their age and a few of them would develop very small drops of water from time to time. Installation was easy, I drained the system, removed the old vents and replaced them with the Taco 400’s. After refilling the system, I opened the top to the bleeder valve and they did remove air from the system. When installed, none of the vents were leaking water.

The problem developed during the winter when 2-3 of the valves began to leak significantly not from the bottom or the bleeder top, but from the screw on type top which seems to be unique to these terrible vents. After wrapping the entire valve and surrounding area with towels and water absorbent material, I was able to get through the winter without replacing the vents. I drained the system after the winter and marked the valves for replacement.

Despite approximately 30% of these valves failing and leaking within about 6 months; I again purchased 2 more on October 17, 2015 to replace the leaky ones, I also had one remaining from the original batch. Installation was the same, drain the system and reinstall.
Beginning in late January, 2016 I noticed that both of the new replacement valves were developing leaks from the same exact spot at the previous valves. Again, I tried to stop the leak and contain it in order to get through the season. Unfortunately for me, by February 20th, 2016 the leaks were so bad that the valves were pouring water into the basement in multiple spots.
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I was struggling with air in my baseboard heaters and kept trying to bleed the system and the noises kept coming back. Someone suggested I give this a try. I installed it, which was very easy, and the noises immediately went away. Wonderful! Couldn't be happier.
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Size: Glossy Exclusive Paper Verified Purchase
I've used several kinds of air vent in hydronic heating systems. Most don't pass the test of time; they get corroded or scaled up and either leak or won't vent but these guys keep working for years and year. These are the only kind I'll use.
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