When your supply line ends in a 3/4" NPT female fitting and your fixture has a G 1/2" female connection, this adapter fills the gap cleanly. One compact brass piece — 1 × 1.5 × 1.5 inches — handles the thread standard mismatch between British BSPP and US NPT systems without reducers, unions, or workarounds. Lead-free construction, rated to 230 psi, backed by a lifetime warranty.

Thread Standards — What You're Working With

G thread (BSPP) runs at a constant diameter along its length. It relies on a face seal — usually a washer or O-ring — to stop leaks, not thread compression. NPT thread is tapered: it gets narrower toward the end and seals by wedging the threads together as you tighten. This adapter is machined to work with both behaviors simultaneously, so each end seals correctly for its standard without forcing one system to behave like the other.

Specifications

• Size: 1/2" G Female × 3/4" NPT Female
• G Thread (inlet): BSPP, parallel, 1/2"
• NPT Thread (outlet): Tapered, 3/4"
• Material: Lead-free brass
• Pressure Rating: Up to 230 psi
• Temperature Range: -65°F to +250°F (-53°C to +121°C)
• Dimensions: 1 × 1.5 × 1.5 inches
• Weight: 3.2 oz
• Style: Female × Female
• Model: CSSL5616430
• Brand: Cascada Showers
• Warranty: Lifetime
• Package: 1 adapter

Common Applications

Used when connecting Cascada or other European-spec shower valves, thermostatic cartridges, or fixture inlets — which typically use G 1/2" female ports — into US supply lines with 3/4" NPT male risers or stub-outs. Also common in commercial projects where imported equipment runs alongside US-standard plumbing infrastructure.

Need a male-to-male version or a different size combination? See the full shower fitting adapter range at Horizon Direct Depot.