We make this Power Jet in Two sizes, a 50mm and 40mm with Precision Pressure Jet.

A "Power Jet" work best when fitted to the rear of the sluice header box, but can be fitted anywhere along the vacuum hose. When fitting this power jet near the start of the vacuum hose you are forcing the gravel up the hose and when you fit this Jet to the sluice end, you draw the gravel up the hose to the header box.