Home » Handline Nozzle » Foam Expansion Tube Foam Expansion Tube When greater expansion rates of foam solution are needed, a foam aeration tube can be quickly attached to many of Elkhart Brass combination fog nozzles. Category: Handline Nozzle Tags: Fire Fighting Equipment, Nozzle Related products Hydrant Pillar High Pressure Hydrant Pillar Two Way Chief Fire Monitor – Tillers Hydrant Box Type – B