NORAC UC4+BC+HD4 Part 1 - Manual (Page 27)

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4.8.2 DELTA (LPZ)
Mount the block as illustrated in Figure 26.
This will require drilling holes though the sheet-
metal on the boom. Use Item B14 and B15 (do
not use Item B10 mounting hardware).
Figure 25: Valve Block Mounting Location on LPZ
Figure 26: Valve Block Mounted on LPZ