Luer connector including a primary Luer male connector, having a secondary female section extending from a top distal part of the primary Luer male connector back towards a proximal part thereof, the primary Luer male connector including a first inner fluid flow channel extending from a proximal end thereof to the secondary female section, the primary Luer male connector being configured to mate with a primary Luer female connector having a secondary male section including a second inner fluid flow channel.

The present invention provides improved couplings for conduit systems. A male coupling and a female coupling may be mechanically engaged by inserting the male coupling into a receiver in the female coupling until fastening structures are aligned, and then rotating one or both of the male and female couplings until the fastening structures are overlapping and in interfacial engagement. The male and female couplings provide an efficient coupling solution for end-to-end conduit connection and also addresses a leakage problem in conventional irrigation pipe couplers.

A quick coupling set includes a socket and a mating plug. The socket has a rotation-restraining structure while the mating plug has a mating rotation-restraining structure. In the coupling of the socket and the mating plug, the rotation-restraining structure of the socket only allow the rotation-restraining structure of the mating plug to relatively rotate in a rotation direction, so as to complete the coupling of the socket and the mating plug. Other plugs which do not match the socket lack of a rotation-restraining structure matching that of the socket, and cannot relatively rotate in the rotation direction with respect to the socket and cannot achieve any coupling with the socket, which results in the socket and the mating plug being protected against misconnection.

A quick coupling set includes a socket and a mating plug. The socket has a rotation-restraining structure while the mating plug has a mating rotation-restraining structure. In the coupling of the socket and the mating plug, the rotation-restraining structure of the socket only allow the rotation-restraining structure of the mating plug to relatively rotate in a rotation direction, so as to complete the coupling of the socket and the mating plug. Other plugs which do not match the socket lack of a rotation-restraining structure matching that of the socket, and cannot relatively rotate in the rotation direction with respect to the socket and cannot achieve any coupling with the socket, which results in the socket and the mating plug being protected against misconnection.

Provided is a fluid transfer connector plug that allows for easy engagement of keys with key grooves. The fluid transfer connector plug includes: a plug body having a proximal end and a distal end, the proximal end allowing a hose to be fixed thereto, the distal end being removably connected to a socket, the plug body including a fluid channel communicating with the hose; a key plate on an outer periphery of the plug body, the key plate being rotatable relative to the plug body; and two or more keys on the key plate. The plug further includes a main key having a larger circumferential width than that of each of the other keys.

Provided is a fluid transfer connector plug that allows for easy engagement of keys with key grooves. The fluid transfer connector plug includes: a plug body having a proximal end and a distal end, the proximal end allowing a hose to be fixed thereto, the distal end being removably connected to a socket, the plug body including a fluid channel communicating with the hose; a key plate on an outer periphery of the plug body, the key plate being rotatable relative to the plug body; and two or more keys on the key plate. The plug further includes a main key having a larger circumferential width than that of each of the other keys.

A low-emission nozzle and receptacle coupling for cryogenic fluid is disclosed. An example nozzle includes a body including a front end and a back end and defining a chamber through which the cryogenic fluid is to flow to the receptacle. The nozzle includes a shaft having a first end and a second end. The shaft is housed within and slidably extending through the chamber. The nozzle includes a poppet coupled to the first end of the shaft and an actuator including a stem coupled to the second end of the shaft. The stem is configured to linearly actuate to cause the shaft and the poppet to linearly actuate. The nozzle includes a coupling assembly coupling the actuator to the back end of the body. The coupling assembly includes insulating material to thermally isolate the actuator from the chamber through which the cryogenic fluid is to flow.

A low-emission nozzle and receptacle coupling for cryogenic fluid is disclosed. An example nozzle includes a body including a front end and a back end and defining a chamber through which the cryogenic fluid is to flow to the receptacle. The nozzle includes a shaft having a first end and a second end. The shaft is housed within and slidably extending through the chamber. The nozzle includes a poppet coupled to the first end of the shaft and an actuator including a stem coupled to the second end of the shaft. The stem is configured to linearly actuate to cause the shaft and the poppet to linearly actuate. The nozzle includes a coupling assembly coupling the actuator to the back end of the body. The coupling assembly includes insulating material to thermally isolate the actuator from the chamber through which the cryogenic fluid is to flow.

A one-hand engageable vacuum tool connection assembly for connection to a commercial vehicle vacuum system that includes: a vacuum tool connection assembly hose having a first end and a second end; an upper assembly and a lower assembly having a tool connector where the tool connector engages a second end of the lower assembly swivel cuff and is typically adapted to receive one or a plurality of different types of vacuum tools. The vacuum tool engagement assembly is typically free of any flapper valve, metal or spring biased elements.

A one-hand engageable vacuum tool connection assembly for connection to a commercial vehicle vacuum system that includes: a vacuum tool connection assembly hose having a first end and a second end; an upper assembly and a lower assembly having a tool connector where the tool connector engages a second end of the lower assembly swivel cuff and is typically adapted to receive one or a plurality of different types of vacuum tools. The vacuum tool engagement assembly is typically free of any flapper valve, metal or spring biased elements.