In recent years, it has been shown that 3/16'' diameter tubing helps create additional vacuum upstream when the tube is full. Although, the slope must be sTÉSp enough that the vacuum effect is created. Unfortunately, sugarbushes do not always come with ideal topography characteristics for this type of installation. It is therefore logical to believe that this effect could be observed using 3/16 drops on a 5/16 tubing network. Recently, some producers have in fact observed an additional vacuum was indeed created by using 3/16 on a 5/16 lateral. The H2O 712, paired with a 705-3 spout, was exactly designed for this sole purpose.