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Old 08-09-2018, 09:21 AM   #9
porkchop
Senior Member
 
Join Date: Sep 2010
Location: Nebraska
Posts: 382
DRV uses studor vents at all fixtures. The common vent for black and gray are for the tanks only. Tied together just above the black tank, depending on the lay out. Straight up and out. No twists or turns.

Bill
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