A heating/ventilating/air conditioning (HVAC) air duct cleaning system with certain improvements having a system housing containing a vacuum-generating subsystem, a rotating motor with an output shaft, and a debris reservoir; a hose connection panel on the system housing positioned at an angle of approximately 45 degrees from horizontal; and a hose coupler on the hose connection panel, configured to receive a duct cleaning hose and to transfer rotational energy from the output shaft to a connection end of a rotatable cable when received into the guide portion, wherein the coupler provides coaxial alignment between the guide portion and the output shaft.

A heating/ventilating/air conditioning (HVAC) air duct cleaning system with certain improvements having a system housing containing a vacuum-generating subsystem, a rotating motor with an output shaft, and a debris reservoir; a hose connection panel on the system housing positioned at an angle of approximately 45 degrees from horizontal; and a hose coupler on the hose connection panel, configured to receive a duct cleaning hose and to transfer rotational energy from the output shaft to a connection end of a rotatable cable when received into the guide portion, wherein the coupler provides coaxial alignment between the guide portion and the output shaft.

A long-effect self-cleaning negative-pressure ejector at least comprises a suction chamber, a jet pipe and a flushing member. A side wall of the suction chamber has at least one suction port for communicating with a first fluid pipeline. An exit port of the jet pipe is disposed in the suction chamber and ejects a second fluid so that a negative pressure is generated in the suction chamber, a first fluid in the first fluid pipeline obliquely enters the suction chamber, and a first included angle is between a direction in which the first fluid being sucked into the suction chamber and an ejection direction of the second fluid. The flushing member optionally provides a third fluid to flush the suction chamber and/or the first fluid pipeline. At least one air jet nozzle is disposed on the first fluid pipeline to inject gas into the first fluid pipeline.

A long-effect self-cleaning negative-pressure ejector at least comprises a suction chamber, a jet pipe and a flushing member. A side wall of the suction chamber has at least one suction port for communicating with a first fluid pipeline. An exit port of the jet pipe is disposed in the suction chamber and ejects a second fluid so that a negative pressure is generated in the suction chamber, a first fluid in the first fluid pipeline obliquely enters the suction chamber, and a first included angle is between a direction in which the first fluid being sucked into the suction chamber and an ejection direction of the second fluid. The flushing member optionally provides a third fluid to flush the suction chamber and/or the first fluid pipeline. At least one air jet nozzle is disposed on the first fluid pipeline to inject gas into the first fluid pipeline.

A system for removing residual reductant from at least one component of a reductant dosing system associated with an aftertreatment system includes a first container disposed in fluid communication with the reductant dosing system. The system also includes a first conduit for providing fluid communication between the first container and the reductant dosing system. Based on a generation of a vacuum within the first container, the first conduit is operative to remove the residual reductant from the at least one component of the reductant dosing system and introduce the residual reductant into the first container.

A system for removing residual reductant from at least one component of a reductant dosing system associated with an aftertreatment system includes a first container disposed in fluid communication with the reductant dosing system. The system also includes a first conduit for providing fluid communication between the first container and the reductant dosing system. Based on a generation of a vacuum within the first container, the first conduit is operative to remove the residual reductant from the at least one component of the reductant dosing system and introduce the residual reductant into the first container.

A septic line cleaning assistance device that positions into alignment with a lower opening in a T-pipe to plug the lower opening in the T-pipe. The blocked lower opening enables a suction apparatus to suck waste from a pipe connected to a waste opening in the T-pipe through an upper opening in the T-pipe. A rod is configured to be inserted along the T-pipe and positioned into place along the T-pipe. The rod comprises a plug end holding the plug that is configured to frictionally engage the lower opening in the T-pipe to effectively seal the lower opening. A handle end having a grip enables the positioning of the plug over the lower opening, and pulling the plug into a mating position with the lower opening. An adjustable peripheral fastener is slidably positioned over the upper end of the T pipe to hold the device and plug in place.

A septic line cleaning assistance device that positions into alignment with a lower opening in a T-pipe to plug the lower opening in the T-pipe. The blocked lower opening enables a suction apparatus to suck waste from a pipe connected to a waste opening in the T-pipe through an upper opening in the T-pipe. A rod is configured to be inserted along the T-pipe and positioned into place along the T-pipe. The rod comprises a plug end holding the plug that is configured to frictionally engage the lower opening in the T-pipe to effectively seal the lower opening. A handle end having a grip enables the positioning of the plug over the lower opening, and pulling the plug into a mating position with the lower opening. An adjustable peripheral fastener is slidably positioned over the upper end of the T pipe to hold the device and plug in place.

A portable and compact, hand-held electrically powered vacuum tool, designed expressly for suctioning clogs from the drains and traps of sinks and bathtubs to pull clogs out of drains and traps thereby clearing the clog without use of chemicals and recover items such as rings and toothpaste-tube caps that have gone down the drain.

A portable and compact, hand-held electrically powered vacuum tool, designed expressly for suctioning clogs from the drains and traps of sinks and bathtubs to pull clogs out of drains and traps thereby clearing the clog without use of chemicals and recover items such as rings and toothpaste-tube caps that have gone down the drain.