The Caleffi 538402 FD is a Drain Valve 1/2" NPT x 3/4" Garden Hose Thread. Replacement blowdown drain valve for 548 and 5495 series union-connection separators.
Supplied as an individual service or field-installed component for Caleffi hydraulic separator, HydroCal and SEP4 installations. It is not a standalone separator.
Technical Specifications
| Inlet Connection | 1/2" NPT |
| Outlet Connection | 3/4" garden hose thread |
| Maximum Working Pressure | 150 psi (10 bar) |
| Maximum Working Temperature | 250 °F |
| Body Material | Brass |
| Suitable Fluids | Water, glycol solution to 50% |
| Supplied With | Cap |
| Product Type | Drain Valve |
Specifications on this page are taken from the Caleffi North America documents linked below. Last verified July 2026.
Documentation
Related Products
Frequently Asked Questions
What is the Caleffi 538402 FD used for?
Replacement blowdown drain valve for 548 and 5495 series union-connection separators. It is supplied as an individual service or field-installed component.
Is the Caleffi 538402 FD a complete separator?
No. The 538402 FD is a drain valve that is fitted to or supplied with a Caleffi separator. It does not provide hydraulic, air, dirt or magnetic separation on its own.
- Type:
- Drain Valve
- Product Line:
- Separator Accessories
- Accessory Category:
- Drain Valve
- Body Material:
- Brass
- Connection Type:
- NPT Male
- Connection Size:
- 1/2 inch
- ASME Code Stamped:
- No
