100PCS 3/8-Inch Brass Compression Stop Valve Cap - Bulk Brass Fittings

In this review the 100PCS 3/8-Inch Brass Compression Stop Valve Cap is presented as a practical, no-nonsense solution for anyone who needs a reliable set of small fittings for air, water, fuel, oil or inert gas lines. The single biggest reason to buy is the combination of quantity and material: a 100-piece pack of heavy-duty brass compression caps that offer corrosion resistance and high temperature ductility, making them useful for frequent repairs and repetitive installations where durability and consistent fit matter.

Key Features

• Heavy-duty brass construction: The brass material provides corrosion resistance and low permeability so fittings hold up in wet or gaseous environments.
• Compression cap design: The compression cap style makes for a quick, simple connection to 3/8' OD tubing without the need for soldering or complex tools.
• 100-piece pack: Supplied as a bulk set so spare parts are on hand for multiple repairs, shop use, or repeated installations.
• Wide temperature range: Rated to operate from -65 to +250 degrees F, allowing use in applications with significant temperature variation.
• Multi-application use: Suitable for air, water, fuel, oil and inert gases, offering flexibility across common pneumatic and fluid tasks.

Who It's For

This product is aimed at plumbers, hobbyists, homebrewers, shop technicians and DIYers who need a reliable supply of small compression caps for 3/8' OD tubing. It works well for routine maintenance, plumbing linkups, CO2 regulator connections and valve-to-hose setups where repeated, consistent connections are needed.

Those who should look elsewhere include users who require metric sizes, specialized high-pressure fittings beyond common pneumatic and plumbing tasks, or individuals needing fittings finished for visible decor-sensitive fixtures; this pack focuses on practical, functional use rather than cosmetic appeal.

Pros & Cons

Pros

• Good value for bulk use, supplying enough caps for many installations or spares.
• Quality brass construction gives reliable corrosion resistance and durability.
• Compression design makes connections straightforward and tool-friendly.
• Wide temperature tolerance expands usable applications across environments.

Cons

• Bulk packaging may include occasional pieces with minor fit variation, so users should inspect before installation.
• Only available for 3/8' OD tubing, so not suitable for other tube sizes.

Specifications

Material	Heavy-duty brass
Type	Compression Cap Stop Valve Cap
Tube Size	3/8' OD
Quantity	100PCS
Operating Temperature	-65 to +250 degrees F
Applications	Air, water, fuel, oil, inert gases

Our Verdict

The 100PCS 3/8-Inch Brass Compression Stop Valve Cap is a practical pick for anyone who needs a durable, high-volume supply of 3/8' compression caps. Its heavy-duty brass construction, broad temperature range and straightforward compression fit make it good value for workshops, service technicians and frequent installers who prioritize function and reliability.

Frequently Asked Questions

Are these caps compatible with CO2 regulator lines?
Yes, customers report they fit valve-to-hose setups and work well with CO2 regulator connections when using 3/8' OD tubing.

Do these require special tools to install?
No special tools are needed beyond standard compression fitting tools; the compression cap design is intended for quick and simple connections.

Can these be used outdoors or in corrosive environments?
The brass construction offers corrosion resistance and the fittings operate across a wide temperature range, but for highly corrosive chemical exposure a specialized material may be preferable.