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The OPW 61-T Drop Tube is inserted in the underground storage tank riser pipe to permit the efficient delivery of fuel. Delivery is speeded and less vapor is generated with submerged fil- ling using the OPW 61 J. The OPW 61- T is flared at the upper end and rests on top of the fill pipe, the OPW tight fill adaptor screws into the riser, hold- ing the drop tube in place. The bottom of the 61-T is furnished cut straight, but is generally cut to length on the job -site at 45°. The distance from the tank bottom to the drop tube bottom should be 6" to 12", or per local requirements. s The OPW 23 Vent has an aluminum body and a 40 -mesh brass screen. The OPW 23 is an open vent and directs vapors upward in accordance with NFPA Code 30. Set screws make in- stallation easy. Available in 1'/2", 2" and 3" sizes. The OPW 523 Pressure Vacuum Vent is an upward vapor discharge vent and is available with an 8 oz. pressure set- ting and a 1/2 oz. vacuum setting. The 523 is available in 2" size, and is attached to the 2" threaded vent pipe. The OPW 523-S Pressure Vacuum Vent is similar to the 523 above, except it is attached to the vent line with set screws rather than pipe threads. A gasket is provided. Available in 2" size. The rated maximum flow pressure drop for all OPW 523 Vents is 28 oz. per square inch at 7000 SCFH. Dimensions Product No. Riser Pipe & Suffix Size Length Wt. 61T-7244 3" 10' 3.14 61T-7266 4" 10' 5.12 61 T-7268 4" 12' 6.18 61T-7368 4" 15' 7.65 Replacement gaskets for 4" 61-T and 61 -SO Series are available. Order OPW 61 -TG (4000). NEUTF Dimensions Product No. & Suffix Size Wt. 23-0044 11/2" 0.27 23-0033 2" 0.23 23-0055 3" 1.02 523-1100 2" 0.85 523-S-1150 2" 0.88 24 L2 11