Abstract: A jarring tool can include a longitudinally displaceable piston, a first fluid chamber having a volume that decreases in response to displacement of the piston, a flow controller that controls flow of fluid between the first fluid chamber and a second fluid chamber, and a plug seat secured to the piston. A method of applying a jarring force can include applying a pressure differential across a plug in a jarring tool, the plug restricting flow from a first flow passage section to a second flow passage section, then increasing a flow rate of fluid from the first flow passage section. Another jarring tool can include an outer housing with a longitudinal flow passage and seal surfaces at opposite ends of the outer housing, and a flow obstruction, fluid flow through the flow passage being increased in response to application of a pressure differential across the obstruction.

Abstract: This adapter consists primarily of a main body with an insert, which connects to the deck fitting of a boat, so as to enable a constant flow of water to be supplied, by a garden hose, to the boat's holding tanks, when the boat is at dock-side. The adapter includes a screw cap, so as to enable the tanks to be filled by bucket, or other methods when desired, and it further includes an inspection window, and a strainer.