Hardi EAGLE 3PT Boom Operator's Manual page 75

11.3 Foam Marker System
Fig. 49
Foam Marker Tank & Compressor
Fig.50
Foam Marker Drop Assembly
The Foam Marker helps prevent skipping or over lapping during spray
application of solution, both which can be costly. HARDI Foam Marker
features a trailer mounted compressor, poly tank, extruded foamer hoses
and in-cab electrical controls providing right or left drop selection and the
rate/quality of foam droplets.
HARDI ® EAGLE 3PT BOOM OPERATORS MANUAL 73