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Determine drop tube lengths <br />Defender Spill Containment (Ref.) <br />VA <br />Upper Drop Tube <br />Seat surface of upper drop tube <br /><<XaTop of Tank <br />Final Shutoff Volume"' <br />Overfill Preverition Valve-' <br />(U.S.T.) <br />Lower <br />Drop Tube <br /><<Y„ <br />"B" <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 <br />Actual Tank Capacity <br />14,9 .Z Gallons <br />X (Multiply) <br />j).rjLf 43 Typically 95%** <br />Final shutoff volume <br />(gallons) <br />B <br />Final Shutoff Volume Height <br />6 <br />To find Upper Drop Tube length "X' <br />"A", -18 ��t� <br />Drop tube seat <br />surfaceto <br />B <br />bottom of tank <br />_ (Subtract) <br />OPV Length <br />offset <br />u <br />Final shutoff <br />volume height <br />- (subtract) <br />2'/z" (63.5 mm) <br />Position and <br />mounting <br />_ (equals} <br />adjustment <br />,X1 <br />Upper Drop Tube Length <br />UG1I <br />To find Lower Drop Tube length "Y" <br />p IF <br />Final shutoff <br />B <br />volume height <br />- (subtract) <br />153/" (400 mm) <br />OPV Length <br />offset <br />- (subtract) <br />1 ; <br />S�L <br />Tank bottom <br />clearance <br />_ (equals) <br />"Y„ <br />Lower Drop Tube Length <br />