AHFMANG Brass Compression Tube Fitting Adapter, 3/8" NPT x 5/8" OD, 2-Piece

The 3/8" NPT x 5/8" OD size pairs a threaded pipe connection with a compression connection for tubing. This two-piece AHFMANG set is made of brass and uses a straight male adapter format.

Use it to connect copper pipe or plastic tubing at one end and NPT pipe at the other. The compression fitting includes a nut, sleeve and body, bringing the connection components together in one adapter.

For plumbing or pipeline projects involving oil, gas, water and other fluids, the combined connection format helps bridge tubing and threaded pipe without changing to a different fitting style.

Tips for day-to-day use

Match the tubing end to 5/8" OD tubing and the threaded end to a 3/8" NPT pipe connection. The fitting is intended for copper pipe or plastic tubing, so it can suit projects that use either of those tubing materials. Checking both connection types before selecting a fitting helps keep the parts in a system consistent and makes it easier to plan a direct tubing-to-pipe connection.

The straight design is useful where the tubing and pipe can meet in a direct line. For example, when connecting a length of tubing to an NPT pipe run, this adapter combines the compression fitting and male threaded connection in one piece. Its nut, sleeve and body form the compression side, while the opposite end connects to the pipe.

Strengths

Brass construction gives the adapter its specified material and finish, while the straight format keeps the connection focused on joining tubing with threaded pipe. Rather than choosing separate connector styles for each end, this fitting brings a 5/8" OD compression connection and a 3/8" NPT male connection together. That makes the connection type clear when matching fittings for a project.

The set contains two adapters, providing a pair for jobs that call for more than one connection. The fittings are described for use in oil, gas, water and other pipeline systems, and the design supports disassembly, installation and maintenance. It can therefore suit both a new connection and a system task where access for maintenance matters.

Key features

The defining detail is the combination of 5/8" OD tubing compatibility and a 3/8" NPT threaded pipe end. The compression adapter is made from brass and is intended for copper pipe or plastic tubing. Its male straight configuration connects tubing at one end and NPT pipe at the other, keeping the two connection types in a single fitting.

Each compression fitting includes a nut, sleeve and body. The two-piece set is a practical format for projects that need two of the same adapter, such as making corresponding tubing-to-pipe connections. It is the connection size and style—not simply the brass colour—that distinguishes this fitting from adapters with different tubing diameters, thread sizes or angled layouts.

When it makes sense

It makes sense if your project needs a straight brass adapter between 5/8" OD copper pipe or plastic tubing and a 3/8" NPT pipe connection. The two-piece set is useful when planning multiple connections with the same specifications, while the compression components support installation and later disassembly for maintenance.

For a direct connection between tubing and threaded pipe in an oil, gas or water pipeline system, this AHFMANG adapter offers a clearly defined combination of size, material and connection type. Choose it when those connection details match the parts in your project.