An air-line safeguard for use with an air-line connection comprising a first connector and an opposing connector, wherein the first connector comprises a tongue, an interface, and a shaft and wherein the opposing connector comprises an opposing tongue, an opposing interface and an opposing shaft, the safeguard comprising of at least one body that removably attaches to and accommodates the first air-line connector and extends between the shaft and the tongue of the first connector and least partially between the opposing tongue and the opposing shaft of the opposing connector to prevent the first connector from substantially rotating relative to the opposing connector.

An air-line safeguard for use with an air-line connection comprising a first connector and an opposing connector, wherein the first connector comprises a tongue, an interface, and a shaft and wherein the opposing connector comprises an opposing tongue, an opposing interface and an opposing shaft, the safeguard comprising of at least one body that removably attaches to and accommodates the first air-line connector and extends between the shaft and the tongue of the first connector and least partially between the opposing tongue and the opposing shaft of the opposing connector to prevent the first connector from substantially rotating relative to the opposing connector.

A female connector and a plug-in connector comprising the female connector and a male connector that can be coupled to the female connector. The female connector includes a first end configured for being attached to a pipe or a hose and a second end configured for being connected to the male connector. The second end including elastic retention means configured for retaining the male connector inside the female connector. The female connector also includes a non-removable cover arranged at the second end of the female connector covering the retention means, preventing the retention means from being able to be manipulated from the outside of the plug-in connector.

A female connector and a plug-in connector comprising the female connector and a male connector that can be coupled to the female connector. The female connector includes a first end configured for being attached to a pipe or a hose and a second end configured for being connected to the male connector. The second end including elastic retention means configured for retaining the male connector inside the female connector. The female connector also includes a non-removable cover arranged at the second end of the female connector covering the retention means, preventing the retention means from being able to be manipulated from the outside of the plug-in connector.

A fluid delivery system having a safety system with interchangeable parts. Also a safety system having a conduit specifically designed to withstand ultra high-pressure fluids exceeding 24,000 psi.

A fluid delivery system having a safety system with interchangeable parts. Also a safety system having a conduit specifically designed to withstand ultra high-pressure fluids exceeding 24,000 psi.

A garden hose with an outer flexible sheath of spirally wound and linked turns of sheet material, an inner tube of flexible polymer inside the sheath and end couplers with nipples press fit into ends of the tube and connector mechanisms connecting the couplers to the outer sheath. Each connector mechanism has inner and outer press fit shells at the end of the sheath, with flared ends separated by a washer.

A garden hose with an outer flexible sheath of spirally wound and linked turns of sheet material, an inner tube of flexible polymer inside the sheath and end couplers with nipples press fit into ends of the tube and connector mechanisms connecting the couplers to the outer sheath. Each connector mechanism has inner and outer press fit shells at the end of the sheath, with flared ends separated by a washer.

An apparatus for securing air hose couplings together, and for protecting such air hose couplings. A method of securing air hose couplings together.

A diesel fuel cross-drop prevention kit that provides a multitude of couplings and fittings designed only for a single type of fuel. The kit includes a drop-elbow coupler, a storage-tank inlet tube, a primary key slot, a primary key protrusion, a retractable pull pin, a hose, a gravity-drop tube fitting, a secondary key slot, and a secondary key protrusion. The primary key slot traverses into an internal surface of the drop-elbow coupler. The primary key protrusion is externally and laterally connected to the storage-tank inlet tube. The storage-tank inlet tube is positioned within the drop-elbow coupler with the primary key protrusion being positioned within the primary key slot. The secondary key slot traverses into a first female coupler tube of the hose. The secondary key protrusion is externally connected to the gravity-drop tube fitting. This allows the first female coupler tube to fit over the gravity-drop tube fitting.