Garden hose to aerator adapter. 15/16 inch by 27 outside and 55/64 inch by 27 inside threads by 3/4 inches hose connection or 55/64 inches outside threads. Garden hose to aerator adapter. 15/16 inches -27 outside and 55/64 inches -27 inside threads by 3/4 inches hose connection or 55/64 inches outside threads. Carded