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Knockout arrangements and
"FLOWLINE" dimension for
each knockout location
4 Hole
DISTRIBUTION BOX
1” higher inlet
3 level outlets
(DB4-10)
4 Hole - EVEN
DISTRIBUTION BOX
All holes same level
(DB4 -00)
4 Hole - 2” HIGH OVERFLOW
DISTRIBUTION BOX
High inlet and overflow
Side Outlets 2” lower
(DBHO-20)
4 Hole - 4” HIGH OVERFLOW
DISTRIBUTION BOX
High inlet and overflow
Side Outlets 4” lower
(DBHO-40)
4 Hole
MASSACHUSETTS
DISTRIBUTION BOX
12” inside w/ 6 “ sump
2” higher inlet
3 level outlets
(DB4MA)
6 Hole
DISTRIBUTION BOX
1” higher inlet
5 level outlets
(DB-6)

BAFFLE
DISTRIBUTION BOX
2” higher inlet
6 level outlets
(DB-BAF)

MASSACHUSETTS
COMPATIBLE

DB-BAF SECTION
showing BAFFLE

9 Hole
COMPACT
DISTRIBUTION BOX
2” higher inlet
8 level outlets
MASSACHUSETTS
COMPATIBLE
(DB-9)
DIPPER
DISTRIBUTION BOX
3 inlets, 4 outlets
(DB-DIP)

NOTES:
• All pipe knockouts equipped with Miniboot™ pipe seals by Rissy Plastics, LLC
• For 2" and 3" service, use UNIVERSAL BUSHING on the Accessories Page.
• Dimensions vary slightly from those shown. Drawings not to scale.

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