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Determine tube ft <br /> Defender <br /> Spill Contain <br /> ent(Ref.) � g � • <br /> Seat surface of upper drop tube <br /> o <br /> UPPer Drop «X" Tomsk <br /> Tube <br /> A,,— Final Shutoff Volume`* <br /> i <br /> Overfill Prevention Valve <br /> (U.S.T.) «A„ <br /> Lower <br /> Drop Tube "B" <br /> 1 <br /> 6" (152 mm) Max* <br /> Bottom Of Tank Not to Scale <br /> If local codes require this distance to be smaller, <br /> OO subtract less than 6"(152mm) <br /> Calculate final shutoff volume �� TGk6G 2 , <br /> Actual Tank Capacity I To find Upper Drop Tube length"X" To find Lower Drop Tube length"Y" <br /> Gallons „A„ Drop tube seat <br /> surface to "B„ Final shutoff <br /> X (Multiply) bottom of tank d volume height <br /> - (Subtract) - (subtract) • <br /> Typically 95%** Final shutoff 3 OPV Length <br /> B" �C� 15/4'(400 mm) offset <br /> Final shutoff volume volume height <br /> - (subtract) - (subtract) <br /> (gallons) Position andTank bottom <br /> 2'/z"(63.5 mm) mounting 6"(152mm) clearance <br /> (equals) adjustment <br /> _ B =(equals) <br /> I <br /> Final Shutoff Volume Height .X" "Y" , <br /> upper Drop Tube Length <br /> -' '"' Lower Dro Tube Length <br />