NORAC UC4.5-BC-HD4 Part 1 - Manual (Page 35)

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Use the dimensioned drawing below as a guide for drilling the valve block mounting holes for
the LPZ boom. Drill holes large enough to accommodate 3/8” bolts.
See Section 11 for a drilling stencil.
Y = 111.1mm (4.375 in)
X = 82.5mm (3.25 in)
Figure 34: NORAC Valve Block Mounting Hole Dimensions