BRASS CAP

🔧 What it is

• A solid brass cap fitting
• Sized for  NPT (National Pipe Thread) or similar threaded systems
• Designed to screw onto a male-threaded pipe end

⚙️ What it does

• Seals the end of a pipe permanently or temporarily
• Stops flow of water, gas, or air
• Used for system shutdown, pressure testing, or future expansion
• Can be removed if the line needs to be extended later

🧱 Common styles

• Hex cap (most common, tightened with wrench)
• Round/closed cap (less common in plumbing supply)
• Lead-free brass caps for potable water systems (hdssupply.com)

🏗️ Typical uses

• Plumbing system terminations
• Capping unused water or gas lines
• Pressure testing piping systems
• HVAC and hydronic piping closures
• Temporary shutoff during repairs or remodels

🧠 Simple explanation

It’s basically a brass “lid” that screws onto a  pipe to seal it shut.