Fairview 425 Brass Flare Union Coupling, 5/16" Tube OD.
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Fairview 425 brass flare union coupling for 5/16" tube OD—an SAE 45° style union designed to connect tube-to-tube with flare fittings.
Key Features
- Brass flare union coupling for tube-to-tube connections
- 5/16" tube OD size
- SAE 45° flare style union coupling (tube flares)
- “Not for potable water systems” warning included on the product listing
Intended Use
- Marine and industrial plumbing and line connections that use SAE 45° flare fittings
- Low-pressure gas/appliance and refrigeration-style tubing runs using 5/16" tube OD flare connections
Product Details
- Product name (as listed): Fairview 425 Brass Flare Union Coupling, 5/16" Tube OD.
- SKU/Part number: 687-425
- Type: Flare union coupling (tube-to-tube)
- Tube size: 5/16" Tube OD
- Material: Brass
- Listing note: NOT TO BE USED IN POTABLE WATER SYSTEMS
- Weight (variant data): 215 GRAMS
Parts Desk Insights
Best Use Case: Use this union when you need to join two lengths of 5/16" OD flareable tubing using the SAE 45° flare connection method (tube flare seats).
Common Issues: Most leaks with flare unions come from misaligned tube ends, an out-of-round flare, or insufficiently snug flare nut seating. Before final tightening, confirm the flare size/type matches the fitting and inspect mating flare surfaces for damage.
Related Products & Accessories
- Browse flare unions and tube fittings for 5/16" tube OD - Related accessories depend on your tube material and whether you need straight unions or other tube-to-tube configurations.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.