Caleffi DISCAL 1-1/2 Inch Sweat Air Separator
Caleffi DISCAL 1-1/2 Inch Sweat Air Separator
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- LTL Freight Dispatch: Heavy commercial units ship directly via insured LTL carrier with delivery coordination included.
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👉 Request a Commercial Quote or contact our procurement team for direct freight scheduling.
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Formal Purchase Orders (POs) and tax-exempt ordering are accepted for commercial contractors and institutional facilities.
Apply for Trade Account & Terms →Technical Specifications Matrix:
| Manufacturer Part Number (MPN) | 551041A |
| Connection Size | 1-1/2" Sweat (Solder) |
| Ferguson Item Number | 4003271 |
| Recommended Maximum Flow Capacity | 22.0 GPM |
| Valve Flow Coefficient (Cv) | 73.0 |
| Air Removal Efficiency | 100% removal down to micro-bubble level |
| Maximum Working Pressure | 150 psi (10 bar) |
| Working Fluid Temperature Range | 32°F – 250°F (0°C – 120°C) |
| Valve Body Material | Heavy-Duty Brass Housing |
| Internal Coalescing Mesh Material | Glass-reinforced nylon (PA66GF30) |
| Bottom Drain Tap Size | 1/2" NPT Female |
| Product Shipping Weight | 4.90 lbs |
The Caleffi DISCAL® 551 Series air separator continuously extracts micro-bubbles of entrained air from closed hydronic heating and cooling loops. By dropping fluid velocity inside its specially shaped brass body, it allows minuscule air pockets to coalesce, break free from the system media, and vent automatically into the atmosphere.
Equipped with a glass-reinforced nylon internal element, the DISCAL creates a high-performance swirling matrix that captures 100% of trapped system air down to the micro-bubble level. Eliminating oxygen loop-circulation provides premium component protection—preventing mechanical pump noise, reducing terminal unit corrosion, and optimizing boiler plant heat transfer efficiency.
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