AW VB15C Watermarked Chrome Vacuum Breaker suitable for 15mm 1/2" Hose TapsOverview AW (Austworld) VB15C chrome vacuum breaker suitable for DN15 15mm 1 2" hose taps where the tap's outlet is 20mm 3 4". Watermark approved to be used with portable water applications in home, garden and industrial applications. (Check out my store for other options) Technical Details Manufacturer: AW (Austworld) Model: VB15C Thread Size: Water inlet 3 4" BSP (20mm) Female thread; Water outlet 3 4" BSP (20mm) Male thread Material: DR Brass