Graco 157350 Hose Fitting 1/4 x 3/8 NPT Connector Nipple

Type: Precision-engineered nipple reducer fitting designed to connect a 3/8" MNPT to a 1/4" MNPT connection.
Material: Heavy-duty steel construction ensures durability and leak-free performance under pressure.
Pressure Rating: Handles up to 6000 PSI, ideal for Graco airless sprayers and high-performance coating systems.
Application: Used to securely join hoses of different sizes, improving fluid flow and pressure stability.
Compatibility: Works with multiple Graco, Titan, and Wagner spray systems.

$14.52

Based on 0 reviews

Description

What the Graco 157350 Hose Fitting Is & Where It Fits

Compatible Machines (Examples)

This is a universal 1/4" x 3/8" NPT male-to-male connector used across many airless systems. If your sprayer or hose run uses NPT ports in these sizes, this fitting is suitable.

Graco Magnum Series (e.g., X7, X9, ProX7, ProX9)
Graco Nova & Classic (e.g., 390/395/490)
Graco Ultra & Ultra Max II (e.g., 395/495/595)
Graco Contractor/FinishPro units with 1/4" or 3/8" NPT hose runs
Titan airless sprayers using NPT hose manifolds (select models)
Wagner professional airless units with NPT adapters (select models)

Tip: Always confirm your exact port sizes in the machine manual before ordering.

Overview

Graco 157350 is a durable hose fitting / connector nipple that adapts a 1/4" NPT line to a 3/8" NPT line. Designed for professional airless paint sprayer setups, it’s commonly used to bridge main supply lines to whips or filter blocks, or to integrate accessories that require the alternate NPT size. Its male-to-male profile streamlines tight installs and minimizes leak points when properly sealed.

Specifications

Part Number	Graco 157350
Type	Nipple / Reducer Fitting (male-to-male)
Thread Size (Side A)	1/4" NPT (male)
Thread Size (Side B)	3/8" NPT (male)
Typical Working Pressure	Up to 5,000 psi*
Material	Heavy-duty steel (corrosion-resistant finish)
Use Case	Connects/steps between 1/4" and 3/8" NPT hose/manifold ports in airless systems

Always match system pressure ratings; never exceed the lowest rated component.

Fitment & Installation Tips

Confirm both mating ports are NPT (tapered) threads: 1/4" and 3/8".
Use appropriate thread sealant or PTFE tape suitable for paints/solvents; avoid over-wrapping.
Hand start threads to avoid cross-threading; tighten to spec—do not overtighten.
Pressure-test after install; check for seepage at startup and after first use.

Frequently Asked Questions

It functions as a male-to-male adapter that connects 1/4" NPT to 3/8" NPT, effectively “reducing” or “stepping” between the two sizes in your hose/manifold run.

If your sprayer or accessory block uses NPT ports in 1/4" and 3/8", this fitting will fit. Check your manual or the port markings to confirm the thread type and size before purchase.

Use PTFE tape or a liquid thread sealant compatible with paints and solvents. Apply sparingly to avoid debris entering the fluid path and always pressure-check after installation.

Typical working pressure is up to 5,000 psi. Always observe the lowest rated component in your system and never exceed that rating.

Compatibility list is representative; verify port sizes and thread type (NPT) on your specific machine.