Gordon, J.A., 1953. ADAPTOR FOR TESTING SPRINKLER HEADS UNDER HYDRAULIC PRESSURE. Fire Research Notes 84
The connection of a large number of sprinkler heads to a supply line for hydraulic pressure testing has in the past been a slow process. By using an adaptor, in which the machined surface at the end of the sprinkler thread is forced against a rubber washer to provide an effective water seal, the procedure is simplified and quickened considerably.