LU-VS390 Transition Union
Replacement plumbing connection component for the AquaPump Variable Speed 3.9 HP.
Transition Union
Replacement plumbing connection component used within the compatible LU-VS390 pump union assembly.
Temporarily Out of Stock
Contact our team for current availability or help confirming the correct LU-VS390 union component.
Pump Connection
Part of the compatible LU-VS390 plumbing union assembly.
Service Replacement
Designed for pump plumbing repair and replacement.
LU-VS390 Fit
Confirm part LU-VS390-SWP-4 before ordering.
Part of the LU-VS390 Union Assembly
LU-VS390-SWP-4 is a replacement connection component used within the compatible AquaPump VS390 plumbing union assembly.
2-Inch Connection Context
The AquaPump LU-VS390 supports 2-inch union fittings. This is provided as contextual information only — the exact fit of LU-VS390-SWP-4 within that configuration should be confirmed using the approved LU-VS390 parts diagram before ordering.
LU-VS390-SWP-4 is a model-specific LU-VS390 replacement component. It is not a universal 2-inch union and is not interchangeable with LU-VS220 components or other pump brands. Confirm the exact fit from the approved parts record.
Transition Function
The exact transition function of LU-VS390-SWP-4 (pump body to union, union to plumbing, or another fitting geometry) should be confirmed from the approved LU-VS390 parts documentation. Refer to the current AquaPump VS390 manual and parts diagram for the exact installation location and function.
Designed for AquaPump VS390
This replacement part is presented specifically as an LU-VS390 component. Compatibility is only broadened when an approved Illuminex replacement-parts record explicitly confirms another model uses the exact LU-VS390-SWP-4 part.
Pump union components may differ even when the plumbing connection size is the same. Confirm the pump model and replacement-part number before ordering.
Where It Fits
Conceptual location of the transition union within the pump plumbing connection path.
Conceptual product-location visual — refer to the current AquaPump LU-VS390 manual and parts diagram for exact installation details and physical order.
Inspect During Pump Plumbing Service
Inspect for Damage
Check the union component for visible cracking, deformation or other physical damage.
Check the Connection
Inspect the mating union components and sealing surfaces before reassembly.
Replace When Necessary
Use the correct LU-VS390 replacement component when the existing part is damaged or no longer serviceable.
Turn off the pump and disconnect electrical power before servicing.
Relieve system pressure before loosening or removing pump plumbing connections.
Follow the current AquaPump VS390 installation and service instructions during reassembly.
Commonly Serviced Within the Same Union Assembly
These are separate replacement components within the approved LU-VS390 union assembly.
LU-VS390-SWP-4
Transition Union
LU-VS390-SWP-5
Pump Union O-Ring
These parts are shown together for service convenience. They are sold separately and do not need to be replaced together unless both are damaged.
What's Included
Package contents come from the actual product record. No O-ring, union nut, additional fitting, complete union assembly, plumbing pipe, lubricant, or hardware is shown unless actually included.
Confirm the Correct Replacement
Check Your Pump
Confirm that your pump model is LU-VS390.
Identify the Union Component
Confirm that the component being replaced is the SWP-4 transition union in the pump plumbing assembly.
Match the Part Number
Confirm LU-VS390-SWP-4 before requesting the replacement part.
Contact Us About Availability
Tell us about your AquaPump and we'll confirm availability. Your request automatically references this product.
