Caleffi DISCAL 1-1/2 Inch NPT Threaded Air Separator
Caleffi DISCAL 1-1/2 Inch NPT Threaded Air Separator
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The Caleffi DISCAL® 551 Series (Threaded NPT Model) continuously extracts micro-bubbles of entrained air from closed hydronic heating and cooling loops. Featuring heavy-duty 1-1/2" female NPT threaded connections, this model easily threads directly onto rigid commercial system pipe schedules. 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.
Technical Specifications Matrix:
| Manufacturer Part Number (MPN) | 551008A |
| Connection Type & Size | 1-1/2" Female NPT (Threaded Connection) |
| 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 |
Corporate Procurement & PO Processing
Formal Purchase Orders (POs) and tax-exempt ordering are accepted for commercial contractors and institutional facilities.
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- LTL Freight Dispatch: Heavy commercial units ship directly via insured LTL carrier with delivery coordination included.
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