3/8ft NPT Compressed Air Filter Regulator Combo - Auto Drain, 5 Micron

In this review the NANPU 3/8' NPT compressed air filter regulator combo is assessed for workshop and light industrial use; its single biggest selling point is the combination of a 5 micron brass filter element with an automatic drain that simplifies moisture management on small compressors. Installed on a 12 CFM compressor it handled moisture well and delivered stable pressure control, making it a practical choice for hobbyists and small shops that need dependable filtration and straightforward pressure adjustment without complex plumbing.

Key Features

• 3/8' NPT auto drain: The built-in automatic drain evacuates condensate when pressure drops, reducing manual maintenance and protecting downstream tools.
• 5 micron brass element: A durable brass filter element provides fine particulate removal and long service life compared with disposable media.
• 0-150 psi gauge: The included gauge and adjustment knob let users set and lock operating pressure up to the listed range for consistent results.
• Polycarbonate bowl with metal guard: The transparent bowl makes visual inspection of collected moisture easy while the guard adds physical protection.
• Complete installation kit: Comes with two 3/8' NPT fittings, thread seal tape and a pair of metal coupler and plug so most hookups are possible without buying extra parts.

Who It's For

This unit is best for DIYers, automotive hobbyists and small workshop operators who run single-line air tools and compressors up to the stated supply limits and who want an integrated filter and regulator with easy drainage. It suits users who value a reusable brass element and a visible polycarbonate bowl for monitoring moisture.

Those who need very high flow for multiple simultaneous air tools, industrial scale setups, or a wider operating temperature range beyond 41-140F (5-60C) should consider larger or purpose-built systems instead of this compact combo.

Pros & Cons

Pros

• Good filtration performance from the 5 micron brass element with reusable potential for longer life.
• Automatic water drainage reduces manual draining and helps keep tools dry during use.
• Includes gauge, fittings, coupler and plug so installation is straightforward for most users.
• Clear polycarbonate bowl with metal guard makes monitoring and protection simple.

Cons

• Some customers reported occasional leakage, so careful sealing and inspection during installation are advised.
• Flow is rated to 70 SCFM at 90 psi which is suitable for small setups but may be limiting for multiple heavy-duty tools.

Specifications

Connection Size	3/8' NPT
Filter Element	5 micron brass
Max Supply / Operating Pressure	Max supply 145 psi; operating 0-125 psi
Flow Rate	70 SCFM (approx 2000 L/min) at 90 psi
Temperature Range	41-140F (5-60C)
Included Accessories	Polycarbonate bowl with metal guard, gauge 0-150 psi, bracket, metal coupler & plug kit, 2 x 3/8' NPT fittings, thread seal tape

Our Verdict

The NANPU 3/8' NPT filter regulator combo is a practical, cost-effective choice for small shops and hobbyists who need reliable air pressure regulation and moisture control. It offers solid filtration, simple adjustment and useful included fittings, making it good value when paired with a compatible compressor. Users needing industrial-scale flow or extreme operating conditions should look at larger units, but for typical single-line use this unit performs well.

Frequently Asked Questions

Will this fit my compressor lines?
The unit uses 3/8' NPT ports and includes 3/8' fittings, so it fits compressors and hoses with matching threads or with simple adapters.

How does the automatic drain work?
The bowl drains automatically when pressure drops; when pressurized the drainage valve rises and seals until pressure is released, then it opens to expel condensate.

Can the filter element be cleaned or reused?
Yes, the brass 5 micron element is designed for longer life and can be cleaned for reuse rather than disposed of after each service.