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Drop Tubes OPW - The OPW 61-T Drop Tube is inserted in the underground storage tank riser pipe to permit the efficient delivery of Dimensions fuel. Delivery is speeded and less Product No. Riser Pipe vapor is generated with submerged fil- &Suffix Size Length Wt. ling using the OPW 61 J.The OPW 61- 61T-7244 3" 10' 3.14 T is flared at the upper end and rests on top of the fill pipe, the OPW tight 61T-7266 4" 10' 5.12 fill adaptor screws into the riser,hold- 61T-7268 4" 12' 6.18 ing the drop tube in place.The bottom 61T-7368 4" 15' 7.65 of the 61-T is furnished cut straight,but is generally cut to length on the job-site Replacement gaskets for 4"61-T and at 450. 61-SO Series are available.Order The distance from the tank bottom to OPW 61 JG(4000). the drop tube bottom should be 6"to 12", or per local requirements. Vapor Vents Ar OPW 23 k ` The OPW 23 Vent has an aluminum body and a 40-mesh brass screen.The ° OPW 23 is an open vent and directs v vapors upward in accordance with NFPA Code 30. Set screws make in- stallation easy. Available in 11/2", 2" B and 3" sizes. Wressure Vacuum Vente , is an upward vapor discharge vent and is available with an 8 oz.pressure set- OPW 23 OPW 523 ting and a '/2 oz. vacuum setting. The 523 is available in 2"size,and is attached to th threaded vent pipe. Dimensions 523.5- Product No. The OPW 523-S Pressure Vacuum &Suffix Size Wt. Vent is similar to the 523 above,except 23-0044 1'/2" 0.27 it is attached to the vent line with set 23-0033 2" 0.23 screws rather than pipe threads. A 23-0055 3" 1.02 gasket is provided. 523-1100 2" 0.85 Available in 2" size. 523-S-1150 2" 0.88 The rated maximum flow pressure drop for all OPW 523 Vents is 28 oz. per square inch at 7000 SCFH. 'A