Power swivel and gooseneck

A power swivel for rotating a tubular string to form a borehole in a subterranean formation, the power swivel comprising:

• a motor;
• a stem coupled to the motor such that the motor is configured to rotate the stem about a rotational axis, wherein the stem is configured to be coupled to the tubular string;
• a gooseneck in fluid communication with the stem, wherein the gooseneck comprises:
• an inlet section including an inlet and a first fluid flow path extending from the inlet;
• an outlet section coupled to the inlet section, the outlet section including:
• an outlet, a first end, a second end opposite the first end, and an integral flange disposed at a location between the first end and the second end such that a portion of the outlet section extends between the flange and the outlet;
• a second flow passage extending axially from the outlet, wherein the second fluid flow path is in fluid communication with the first fluid flow path;
• a radially outer surface extending from the first end to the second end and including a first polygonal section having a plurality of planar surfaces joined at a plurality of corners, the radially outer surface of the outlet section further including the flange, the flange extending radially outward from the first polygonal section and including a plurality of apertures passing through the flange.