Couplers

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METRIC DESIGNATOR TRADE SIZE (INCH NB) MINIMUM ACCEPTABLE LENGTH OF COUPLING (MM) OUTSIDE DIAMETER OF COUPLING
16 1/2" 41.3 27.38
21 3/4" 41.7 33.73
27 1" 50 39.67
35 11/4" 51.6 49.61
41 11/2" 52.4 56.36
53 2" 54 69.85
63 21/2" 81 83.34
78 3" 84.1 96.84
103 4" 89.3 127

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