A transparent measuring container at the top has an adjustable level indicator so that the operator can see that all of the water that was pumped into the filter separator sump has been recovered. The water filling port is at the top – see the chained plug. An overflow pipe carries excess fuel to a 5-gallon slop collector on the lower platform. See the drain valve for emptying slop collector.

Constructed with materials that will not rust or corrode in water, this specially-designed apparatus can be stored for long periods with clean water inside without danger of malfunction. Stainless steel and brass are the primary materials. The hoses are pressure rated for 250 psi, five times higher than is expected in a fueling system. Buna-N is used in the hose tube while Hypalon® is the cover material.