Caleffi · 2026 catalog
520509AX
¾" sweat union system connections 2.0
Published catalog evidence
Exact manufacturer record
- Code
- 520509AX
- Description
- ¾" sweat union system connections 2.0
- Catalog weight
- 2.4 lb
- Published row
- 520509AX ¾" sweat union system connections 2.0 2.4 -
Verification boundary
What still needs to match
Function and seriesConfirm valve, separator, manifold, fill, control, backflow, or accessory function and exact series.
ConnectionsVerify NPT, sweat, press, PEX, flange or union connection type and size.
Hydronic dutyCheck pressure, temperature, flow/Cv, materials, seals, potable/hydronic approvals, and control compatibility.
InstallationConfirm orientation, envelope, service access, and current Caleffi documentation.
Related catalog codes
Same code prefix
1.7 lb520419A½" sweat union 2.01.7 lb520419AC½" sweat union, check valves 2.02 lb520519A¾" sweat union 2.02.1 lb520519AC¾" sweat union, check valves 2.03.7 lb520619A001 1" sweat union 2.03.8 lb520619AC001 1" sweat union, check valves 2.01.7 lb520416A½" press union 2.01.7 lb520416AC½" press union, check valves 2.0