Abstract: A boat stop is provided for a trailer which is designed to support a boat thereon. The boat stop is secured to either the roller bunk on the trailer or on the frame of the trailer, with the boat stop being positioned behind the lower end of the transom of the boat when the boat is supported on the trailer.

Abstract: A pre-oiler assembly includes a hollow body portion with a hollow float body assembly secured to the lower end thereof. A solenoid operated three-way air valve has one port communicating with the interior of the hollow body, a second port connected to a source of air pressure, and a third port connected to the engine to vent air from the hollow body into the engine. The deactivated position of the air valve connects the first and third ports so as to vent air from an oil chamber within the hollow body, to the engine. The activated position of the air valve connects the first and second ports, such that air under pressure enters the oil chamber to force oil from the hollow body. The float body assembly at the lower end of the hollow body portion has an oil line extending therefrom to the engine to be pre-oiled. A normally closed solenoid operated oil valve is interposed in the oil line, and permits oil passage through the oil line to the engine when activated to the open position.

Abstract: An engine pre-oiler is provided which has an oil chamber and an air chamber separated by a movable diaphragm with bonded steel plate. The air chamber of the pre-oiler is operatively connected to the air source on the vehicle. The oil chamber is refilled from the engine and the air pressure supplied to the air chamber forces the oil, during the pre-oil cycle, to the engine.