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Determine drop tube lengths <br /> Defender Spill Contain ent(Ref.) <br /> Seat surface of upper drop tube <br /> 0 <br /> Top of Tank <br /> Upper Drop Tube <br /> Final Shutoff Volume" <br /> Overfill Prevention Valve <br /> "A„ <br /> (U.S.T.) <br /> Lower <<B„ <br /> Drop Tube <br /> uY,r <br /> 1 <br /> „Y„ <br /> 6" (152 mm) Max' <br /> Bottom of Tank Not to Scale <br /> If local codes require this distance to be smaller, <br /> subtract less than 6"(152mm) <br /> Calculate final shutoff volume -To find Upper Drop Tube length"X" To find Lower Drop Tube length"Y" <br /> ActualTank Capacity ON <br /> Drop tube seat 4 Final shutoff <br /> Gallons "A" surface to "B" volume height <br /> bottom of tank <br /> X (Multiply) - (Subtract) - (subtract) ot=v Length <br /> Final shutoff 151/4"(400 mm) Offset <br /> 3] Typically95% B, r volume height <br /> - (subtract) <br /> = Z - (subtract)Final shutoff volume Position and 6"(152mm) Tank bottom <br /> (gallons) 2Yz"(63.5 mm) mounting clearance <br /> _(equals) adjustment =(equals) <br /> „ „ 6 <br /> Final Shutoff Volume Height /� utweroroprubeLaWt, , a.o Tube <br /> --v <br />