Thread & Fitting Size Chart
| Standard Thread Size | Male Thread Measured O.D. | Commonly Used On |
|---|---|---|
| BSP 1/2″ | 20.4mm | Under Sink Tap Connections (Mixer/Cistern Taps) Reactor Filter Housings |
| BSP 3/4″ | 25.9mm | Garden Taps Laundry Taps (Washing Machine Connections) |
| NPT 1/8″ | 10.3mm | Membrane Filter Housings Quick-Connect Fittings |
| NPT 1/4″ | 13.7mm | 10″ RO/DI System Sump-Style Filter Housings Most Quick-Connect Fittings |
| NPT 3/8″ | 17.3mm | Booster Pump Fittings |