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G <br />DETERMINE DROP TUBE LENGTHS <br />Defender Spill <br />(Ref.) <br />Upper Drop Tube <br />Overfill Prevention Valve <br />Lower <br />Drop Tube <br />o <br />Seat surface of upper drop tube <br />„ X„ Top of Tank <br />Final Shutoff Volume** <br />WA <br />(U.S.T.) <br />1A <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 />Gallons <br />X (Multiply) <br />95 Typically 95%** <br />Final shutoff volume <br />(gallons) <br />0 = B <br />Final Shutoff Volume Height <br />„ A„ <br />To find Upper Drop Tube length "X" To find Lower Drop Tube length "Y" <br />Drop tube seat <br />"A" surface to <br />-Til Final shutoff <br />"B" height <br />bottom of tank <br />volume <br />- (Subtract) <br />- (subtract) <br />„B„ �� Final shutoff <br />OPV Length <br />15Y4° (400 mm) Offset <br />volume height <br />- (subtract) <br />- (subtract) <br />Position and <br />Tank bottom <br />6" (1 52r <br />2'/z" (63.5 mm) mounting <br />clearance <br />_ (equals) adjustment <br />= (equals) <br />Upper Drop Tube Length <br />Lower Drop Tube Length <br />