G thread runs parallel — NPT runs tapered. They don't connect directly, which is exactly what this adapter solves. The Cascada 2½" G male BSPP to 2 1/2" NPT female adapter bridges the two standards in one lead-free brass fitting. No washer needed. Screw-in install. Rated to 300 PSI and handles temperatures from -65°F all the way up to 250°F — built for both residential plumbing and demanding industrial environments. Lifetime warranty.

Thread Connection

• Male side: 2 1/2" G (BSPP) — parallel thread, constant diameter
• Female side:  2 1/2" NPT — tapered thread
• No washer needed — G thread seals by compression on the NPT side; nothing extra required

Where It Gets Used

• Shower systems and valve connections where G thread meets NPT pipework
• Water heater installations — adapting G thread heaters to NPT supply lines
• Industrial plumbing applications requiring large-bore thread conversion
• Plumbing renovations connecting imported BSPP fixtures to US NPT fittings

Features

• Lead-free brass construction — safe for potable water; corrosion-resistant for long-term daily use
• 300 PSI maximum pressure — handles high-pressure lines without compromise
• -65°F to +250°F temperature range — works in both cold water and high-heat applications
• Screw-in installation — hand tools only; no special equipment needed
• Lifetime warranty — Cascada Showers backs every adapter sold

Technical Details

• MPN: CSSL56162559
• Size: 2 1/2" Male G (BSPP) to 2 1/2" Female NPT
• Finish: Brass
• Shape: Adapter
• Installation: Screw-In
• Maximum Pressure: 300 PSI
• Temperature Range: -65°F to +250°F (-53°C to +121°C)
• Measurement System: Inch
• Package Quantity: 1
• Warranty: Lifetime

Package Includes

• 1 × G Thread 2 1/2" Male to NPT 2 1/2" Female Brass Adapter