Abstract: The present disclosure is directed towards systems, devices, and methods for filling doughnut holes. The system comprises a conveyor system that transports doughnut holes between at least a loading section, a culling section, and an injection section. The conveyor system includes a plurality of links coupled together to form a belt. The loading section includes a feeding device that feeds doughnut holes onto the conveyor system. The culling section includes a culling bar that culls excess doughnut holes from the conveyor. The injection section includes an injector system that injects feeds doughnut holes with a filling.

Abstract: A hydraulic cylinder contamination prevention system for preventing large and small contaminants from entering into a hydraulic cylinder, including a hydraulic cylinder rod cover for underwater use with at least one automatic valve for preventing water circulation between the outside environment and the enclosed environment of the cylinder rod cover when the cylinder is stationary, egress of water from the cylinder rod cover when the cylinder is retracted, and ingress of water into the cylinder rod cover when cylinder is extended, and an external and abrasive cylinder rod scrubber.

Abstract: A hydraulic cylinder contamination prevention system for preventing large and small contaminants from entering into a hydraulic cylinder, including a hydraulic cylinder rod cover for underwater use with at least one automatic valve for preventing water circulation between the outside environment and the enclosed environment of the cylinder rod cover when the cylinder is stationary, egress of water from the cylinder rod cover when the cylinder is retracted, and ingress of water into the cylinder rod cover when cylinder is extended, and an external and abrasive cylinder rod scrubber.