Boshart BF-42 Flare Union Coup...
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Boshart BF-42 Flare Union Coupling Fitting

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Model: BF-42-06

In Stock (leaves warehouse same day if ordered before 3pm ET)

$1.89
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Boshart BF-42 Flare Union Coupling Fitting

The Boshart BF-42 Flare Union Coupling is a rough-in fitting designed for plumbing and heating applications involving gas, oil, air and water lines. This union-style flare coupling is applicable with aluminum, brass, copper and steel tubing, making it a versatile choice for contractors working across multiple tubing materials on a single job site. The BF-42 is available in 3/8" and 1/2" sizes, giving installers the flexibility to standardize on a single flare-union platform across common residential and light-commercial tubing runs. Flare fittings like the BF-42 use a mechanical flare connection rather than solvent weld or sweat joints, allowing the coupling to be disassembled and reassembled many times without compromising the seal at the joint. This makes the BF-42 well suited for service lines and connections that may need to be broken down for maintenance, appliance swaps, or future modifications without cutting into existing tubing runs.

Key Features

  • Available Sizes: Offered in 3/8" and 1/2" sizes to match common tubing diameters used in gas, oil, air and water service lines.
  • Flare Connection: Mechanical flare-style union joint that seals reliably and can be taken apart and reconnected repeatedly without affecting seal integrity.
  • Multi-Media Compatibility: Suitable for use with gas, oil, air and water lines in plumbing and heating installations.
  • Broad Tubing Compatibility: Applicable with aluminum, brass, copper and steel tubing, giving installers flexibility when transitioning between tubing types.
  • Union Design: Union-style coupling body allows the connection to be broken and remade in the field for service, repair, or reconfiguration without disturbing adjacent joints.
  • Reusable Seal: Engineered to maintain a consistent seal through repeated assembly and disassembly cycles, reducing the need for fitting replacement during routine service work.

Technical Specifications

  • Country of Origin: China
  • Prop 65 Warning: Lead
  • Packaging: 25 ea
  • Available Sizes: 3/8", 1/2"

Typical Applications

  • Residential and Commercial Rough-In Plumbing
  • Gas and Oil Line Service Connections
  • Compressed Air Line Assembly
  • Water Supply Tubing Connections
  • Heating System Tubing Runs
  • Serviceable Joints Requiring Periodic Disassembly

Why Boshart?

Boshart supplies rough-in plumbing fittings built for the demands of professional installation and service work. The BF-42 flare union coupling is designed to hold a reliable seal across repeated assembly cycles, giving plumbers and contractors a dependable fitting for connections that need to be accessed again down the road. Offered in 3/8" and 1/2" sizes and packaged 25 ea for stocking trucks and service vehicles, the BF-42 is a practical addition to any rough-in fitting inventory for gas, oil, air and water tubing work.

Manufacturer Resources

Product Specs

Prop 65 Warning:
Lead
list_batch:
BOS-20260923
Product Type:
Flare Union Coupling
Connection Type:
Flare
Department:
Plumbing
Product Subgroup:
Fittings and Valves
Product Group:
Fitting

Boshart BF-42-06 – Frequently Asked Questions

1) What sizes does the Boshart BF-42 flare union coupling come in, and which part number do I order?
Two sizes: 3/8 inch (BF-42-06) and 1/2 inch (BF-42-08). Both are flare-to-flare union couplings, so the size refers to the tubing OD on each end. Order by the size of the tubing run you are joining.
2) Is the BF-42 flare union lead free for potable water?
No, treat it as not lead free. Boshart carries a California Prop 65 warning for lead on the BF-42. For a potable drinking water connection in a jurisdiction enforcing lead-free requirements, specify a fitting certified lead free instead. It is fine for gas, oil, air and non-potable water service.
3) Should I use a flare union or a sweat coupling on a serviceable connection?
Use the flare union where the joint has to come apart again. The BF-42 is a union-style flare coupling that can be broken and remade in the field, so an appliance swap or a repair does not mean cutting into the tubing. A sweat or solvent-weld coupling is a permanent joint and is the better choice for a concealed run you never intend to open. Flare joints generally need to stay accessible.
4) Do I need any extra parts or tools to install a BF-42 flare coupling?
No sealant, solder or flux is needed, the seal is made metal to metal by the flare itself. What you do need is a flaring tool and tube cutter to form a clean 45 degree flare on each tube end, plus two wrenches to hold the union body while you tighten the nuts. The coupling is supplied complete as a union, nothing else is ordered alongside it.
5) Can I reuse a BF-42 union after breaking the joint apart?
Yes, that is the point of it. The flare union holds its seal through repeated assembly and disassembly cycles, so the same coupling goes back together after an appliance swap or service call. The flare on the tubing itself is what you inspect, if a flare is cracked or out of round, recut and reflare the tube rather than overtightening the nut.
6) Where is the Boshart BF-42 flare coupling made?
China. Worth knowing if a job carries a domestic-sourcing requirement, in which case the BF-42 will not satisfy it and you will need a fitting with a stated domestic origin.
How fast can I get the Boshart BF-42-06 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Boshart BF-42-06 come with a warranty?
Absolutely. The Boshart BF-42-06 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Boshart BF-42-06?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Boshart BF-42-06 from ZenSupply?
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