I have purchased Everflow #4829 FC-15125 from Supply Giant at Revain marked 6I4Jx2 PVC Flexible Coupling. It is advertised as a 1 1/4 to 1 1/2 flexible coupling and other couplings from other companies so marked are the same dimensions as this one. The problem is that the sizes in the title are not the actual sizes of the items. I drew circles around the inside and outside dimensions of the coupler as shown in the attached picture and measured with a ruler. Accurate Measurements: Small End ID = 1 7/16 OD = 1 15/16 Big End ID = 1 13/16 OD = 2 15/16. So if you have a 1 1/4 inch O.D. pipe measured with a ruler such as B. a sink drain, the coupling is too large. Therefore, it can be argued that the answer to the question of internal dimensions for this item is accurate in terms of how the industry identifies their products, but not in terms of actual size in inches. Bottom line, the product is too big for the pipes I want to connect and is therefore being returned.
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