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STEP 18: LOWER TUBE ASSEMBLY FOR STANDARD VAPOR TIGHT MODELS,PROCEED If a vise is used,clamp on the valve beady casting only to TO STEP 20 ON PAGE 14. avoid damage to the float and tubes. Thread the lower tube onto the valve body until the lower tube bottoms FOR.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. Figure 78 Threaded insert NOTE:Before installing the 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 1 a„ W.C.(113 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 (13) 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 Wank Bottom Protector on the lower tube(Refer to Installation instructions sup- plied with the Tanis Bottom Protector). IMPORTANT:Remove all chips and shavings out of the cut end of the tube. DO NOT remove chips and shavings by dumping thru valve body. 12