Directional 5/2 way valve for SM74/52 impression control GTO46 There is a difference in

There is a difference in operation for the two Heidelberg references

Picture is for illustration purposes only

●  regular application (once weekly) prevents calcium built-up on ink rollers

S and K cylinders and GTO

This is a replacement switching button which sits below the membrane keypad with the square pad areas

Directional 5/2 way valve for SM74/52 impression control GTO46 There is a difference inA pair of these are used used on the square style impression control unit. It is less common for these to need replacing. A better option is to have the complete reconditioned unit PP250 or PP250a which have all the components fully tested. Heidelberg equivalent: M2. 184. 1171