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STEP 18 : LOWER TUBE ASSEMBLY FOR STANDARD VAPOR TIGHT MODELS, PROCEED If a vise is used, clamp on the valve body casting only to TO STEP 20 ON PAGE 149 avoid damage to the float and tubes . Thread the lower tube onto the valve body until the lower tube bottoms FOP' TESTABLE MODELS, PROCEED TO PAGE 13 . out on valve body. Tube can be tightened by hand or with a strap wrench . If a strap wrench is used try to po - sition it on the threaded insert portion of the lower tube to prevent damaging the tube . 3, Threaded insert \ Figure 18 NOTE : Before installing gie valve in the tank, a pres - sure test can be performed on the valve to check for vapor tightness . Seal off both ends of the tube with inflatable plumber's plugs. Apply a maximum 10" W .C. ( 1 /3 PSI ) air pressure. If pressure does not hold and a leak can be located with soap solution, do not install the valve . Send the valve back to OPW for warranty evaluation . CAUTION : Do not over-pressurize. Excess pressure can damage the valve . STEP 19 : CUT LOWER TUBE Measuring from the underside of the inlet tube flange, mark the overall length of the drop tube a distance of ( B) minus 6 " . Determine dimension ( B) from the meas - urements taken in Step 1 , Figure 1 (Top of the Face Seal Adapter below the drain valve outlet in the spill con - tainer to the bottom of the tank) . Saw off the excess tube at a 45 - degree angle or per local codes or require - ments and file off any sharp burrs ( Refer to Figure 24) . Optional : Install the OPW Tank Bottom Protector on the lower tube ( Refer to Installation instructions sup - plied with the Tank Bottom Protector) , IMPORTANT: Remove all chips and shavings out of the cut end of the tube . DO NOT remove chips and shav- ings by dumping thru valve body . 12