The JOHNSON SCREEN PIPE are  made up of rods and wire. 

The rod can be round wire, triangular wire or trapezoid wire. The wire is triangular wire (V-shaped wire).

Slot: 0.5mm,0.75mm,1.0mm,1.5mm,2.0mm in usual

Filter: From outside to inside

Styles of connection: Plain beveled ends, flanged or threaded couplings

Standard length: 2.9m /5.8m to fit 20 feet/40 feet container

JOHNSON SCREEN PIPE can be used in many kinds of medium filtering.