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2015 Maxitrol Company. All Rights Reserved. DRAFT 09.18.2013 44 Model Pipe Size Vent Connection Dimensions A B C D SR400 38 12 18 NPT 12A06 vent limiting device installed. 4 102 mm 2 51 mm 2.2 56 mm 1 25 mm SR500 12 34 18 NPT 12A06 vent limiting device installed. 5.3 135 mm 3.2 81 mm 3.4 86 mm 1.2 30 mm SR600 34 1 18 NPT 12A06 vent limiting device installed. 7 178 mm 3.9 99 mm 4 102 mm 1.5 38 mm SR400 SR500 SR600 NOTE Dimensions are maximums and to be used only as an aid in designing clearance for the valve. Actual production dimensions may vary somewhat from those shown. A D SR SERIES 2 Stage Design Dimensions