400-4 Taco 1/8" Hot Water Float Vent – 150 PSI
The Taco 400-4 Hot Water Float Vent is a high-quality automatic air vent designed for hydronic heating systems. This float-style vent efficiently removes air from hot water systems, helping prevent noise, corrosion, and efficiency loss in boilers and radiators.
Constructed from durable brass, the 400-4 is built for long-lasting performance in residential or commercial heating applications. It is a direct replacement for Taco 400-3, making it a reliable choice for system maintenance and upgrades.
Key Features ✅
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✅ Float-style automatic air vent for hot water systems
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✅ Brass construction – corrosion-resistant and durable
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✅ Straight body pattern with 1/8" Male NPT connection
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✅ Non-adjustable, easy installation
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✅ Direct replacement for Taco 400-3
Technical Specifications 📝
| Specification | Value |
|---|
| Part Number |
400-4 |
| Type |
Hot Water Float Vent |
| Connection Size |
1/8" Male NPT |
| Material |
Brass |
| Body Pattern |
Straight |
| Application |
Hydronic heating systems |
| Mounting Style |
Straight |
| Adjustability |
Non-adjustable |
| Maximum Temperature |
240°F |
| Minimum Temperature |
140°F |
| Maximum System Pressure |
150 psi |
| Maximum Venting Pressure |
50 psi |
| Replaces |
Taco 400-3 |
Common Symptoms Solved ⚡
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❌ Air trapped in heating system causing noise or gurgling
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❌ Reduced boiler efficiency
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❌ Corrosion or damage due to trapped air
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❌ Radiator cold spots
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❌ System cycling or pressure issues
Shopping Tips 🛒
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✅ Confirm your old vent – The 400-4 replaces Taco 400-3.
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✅ Check connection size – 1/8" Male NPT for proper fit.
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✅ Install in upright position – Float vent works best mounted straight.
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✅ Use brass vents for durability – Resists corrosion from water and air exposure.
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✅ Routine maintenance – Replace vents periodically for efficient heating system operation.
Frequently Asked Questions (FAQ) ❓
Q: What does the Taco 400-4 replace?
✅ It is a direct replacement for Taco 400-3.
Q: What type of vent is this?
✅ Float-style automatic air vent for hydronic hot water systems.
Q: What is the maximum temperature and pressure?
✅ Max Temp: 240°F, Max Pressure: 150 psi.
Q: Can I adjust the vent?
✅ No, this is a non-adjustable vent.
Q: What problems does this solve?
✅ Eliminates trapped air, noise, cold spots, and efficiency loss in heating systems.
