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

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

I have really bad water (chlorine), and I go through a lot of these. They plug up and/or fail quickly, and Ive had faulty ones right out of the box. I recommend the Watts FV-4M1. The Watts work better and last much longer, theyre just hard to find and cost a few bucks more.

Im buying this for the second time in 5 years - to replace the original which lasted over 20 years. Same brand / same part number, but no longer made in the USA, hence the much shorter life.

Good product for removing air from hot water heating system. Durability may be an issue as sometimes they will stick and fail to remove air. But overall it work well and doesn’t let water spray out everywhere

I think there is only one type of this, so how could I give any less than 5 stars :-) But Im happy with the purchase, fits as expected and works perfectly.

Works good

1/4

exact replacement - works fine

Same model number as the one my heating contractor had previously used on my system, but they wanted $160 to replace this and a Caleffi auto air vent. This Taco automatic air vent was very easy to replace. Shut off the water supply, close the existing ball valves to isolate the boiler or zone, drain the boiler until the pressure gauge drops to zero. Unscrew the old valve, put Teflon tape on the new one and screw on the new valve. Reverse the process and youre done in 10 minutes. Remember to keep the metal cap loosely in place to allow the air to escape. Note that if you have a tight clearance issue, the Caleffi automatic air vent has a 1/8 narrower profile, which is why the pros had used two different brands on my system (a riser comes very close to the air vent on top of my boiler and the Taco wouldnt fit). Other than where there are clearance issues, my heating contractor prefers Taco.

works