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Brass Female Bsp Coupling

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Description & Features

Constructed from solid brass, this straight female-to-female coupling connects two BSPP-threaded hydraulic lines in a compact, inline configuration. Both ends feature British Standard Parallel Pipe (BSPP) thread, a 3/8" (G 3/8-19) port on one side and a 1/4" (G 1/4-19) port on the other, making it a practical reducer coupling for systems where line sizes differ at the connection point.

The Brass Female BSP Coupling is an Adaptall product, with an overall length of 23 mm and a 22 mm wrench-flat width for straightforward installation with standard tooling. Brass construction offers good corrosion resistance and compatibility with a wide range of hydraulic fluids, making it well suited for use in fluid power and industrial hydraulic assemblies.

SKU: 8043-06-04

Supplier Part Number (MPN): 8043-06-04

Specifications

Connection Size 1
3/8 in
Connection Size 2
1/4 in
Connection Type
Female BSP
Connection Type 1
Female BSP
Connection Type 2
Female BSP
Dimension Standards
BS 5200
Dimensions
23 mm L
Finish
Nickel-Plated
Fitting Type
Adapter
Hex Size
22 mm
Material
Brass
Material Construction
Brass
Series
8043 Series
Thread Size
1/4-19 x 3/8-19

Product Questions & Answers (2)

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Question by: Randy R on Mar 19, 2026, 11:58 AM
Got a line stepping down from 3/8 to 1/4 BSPP and need something to tie em together without a bunch of extra fittings in the way. This the right piece for that?
Answer by: Customer Support on Mar 20, 2026, 9:49 PM
That's what this coupling is built for. One end is G 3/8-19 BSPP and the other is G 1/4-19 BSPP, both female, so it connects two lines of different sizes in a straight inline run. At only 23 mm long it keeps things tight without adding much length to the assembly.
Question by: Hubert H on May 17, 2025, 12:05 PM
What size wrenches do I need to install this fitting?
Answer by: Customer Support on May 18, 2025, 4:17 PM
You'll need a 22 mm wrench for the wrench flats on this coupling. That should give you a good grip to tighten it down without damaging the brass.

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