3/8 NPT Pipe Unions
3/8" NPT Pipe Unions

3/8" NPT Pipe Unions

On this page you will find fuel unions with an 3/8" NPT thread and related materials.

This means that the inlet has an 3/8 inch thread, suitable for a variety of fuel pumps, fuel filters and pressure regulators.

The outlet diameter varies. Please see the individual item description for details.

Please use PTFE tape or Loctite 542 Thread Sealant when (re-)assembling these screw-in couplings in order to properly seal the connection.

3/8" NPT Pipe Unions

!
38NPT8MM
8 mm Pipe Union with 3/8 NPT thread

8 mm Pipe Union with 3/8 NPT thread

Brass straight 8 mm Pipe Union with 3/8th thread.

Union with 3/8" NPT thread for fuel lines with an internal diameter of 8 mm.

Specification:
Inlet: 3/8" NPT
Outlet: 8 millimeter

Please use our superior quality PTFE tape each time that you (re-)assemble screwed connections in the fuel tract in order to properly seal the connection.
As an alternative, you can use our Loctite 542 Thread Sealant which will offer the added properties of protecting your connections from undoing themselves.

Despite the barbed edge on these unions, we strongly advise you to secure your fuel lines using our Premium Quality Stainless Steel Jubilee Clips.
For your convenience, you can order these right along with the joiner by simply selecting them through the dropbox.

8 mm Pipe Union with 3/8 NPT thread

67263TS
Roll of Superior Quality PTFE Thread Sealing Tape

Roll of Superior Quality PTFE Thread Sealing Tape

Roll of superior quality PTFE tape, used to thoroughly seal the connection of screw-in couplings on the bodies of fuel pumps, pressure regulators, fuel filters and the likes.

12 millimeter wide

Roll of 12 meters (around 36 ft. !); probably enough to last you a life-time!

As an alternative, you can use our Loctite 243 Thread Locker which will offer the added avantage of securing the connection.

 

 

Roll of Superior Quality PTFE Thread Sealing Tape

LOCTITE243-5ML
5 ml Loctite 243 Thread Locker

5 ml Loctite 243 Thread Locker

LOCTITE 243

Threadlocking Adhesive - medium strength.

General purpose.

Suitable for all metal threaded assemblies.

LOCTITE 243 is a general purpose threadlocker of medium bond strength.
This threadlocker secures and seal bolts, nuts and studs to prevent loosening due to vibration.
The product works on all metals, including passive substrates such as stainless steel, aluminium and plated surfaces.
It is proven to be tolerant of minor contamination due to industrial oils, e.g. engine oils, corrosion prevention oils and cutting fluids.

Your Benefits 

  • Prevents loosening on vibrating assemblies, e.g. pumps, gear boxes or presses
  • Works on all metals, including passive substrates (e.g. stainless steel, aluminium, plated surfaces)
  • Proven to tolerate minor contamination by industrial oils, e.g. engine oils, corrosion prevention oils and cutting fluids
  • Permits disassembly with hand tools for servicing P1 NSF Reg. No.: 123000

5 ml Loctite 243 Thread Locker

LOCTITE542-10ML
10 ml Loctite 542 Thread Sealant

10 ml Loctite 542 Thread Sealant

LOCTITE 542

Thread Sealant - medium strength.
For fine threads in hydraulic, pneumatic and general fittings.
Fast curing.

LOCTITE 542 is designed for the locking and sealing of metal pipes and fittings as well as other cylindrical metal assemblies.
The product cures when confined in the absence of air between close-fitting metal surfaces and prevents loosening and leakage due to shock and vibration.
The thixotropic nature of LOCTITE 542 reduces the migration of liquid product after application to the part.

Your Benefits:

  • Ideal for fine threads as used in hydraulic, pneumatic & general fittings
  • Suitable for metal threads only
  • Instant low-pressure seal
  • Resistant to fuel, oil, coolants and hydraulic fluids
  • Locks connection against vibration loosening
  • DVGW approval (EN 751-1): NG-5146AR0855

Excellently suited for sealing connections on carburetors and fuel pumps!

10 ml Loctite 542 Thread Sealant