Brass Ring Syphons GNW Instrumentation Sale! from 4500 /per Thread 1/4" BSP Male to 1/4" BSP Male 3/8" BSP Male to 3/8" BSP Male 1/2" BSP Male to 1/2" BSP Male Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. A range of standard brass "Ring" syphons to help reduce the temperature of the medium before entering the gauge. Tweet