A drainage device for an above-ground pool, and an above-ground pool including the drainage device are provided. The drainage device includes a drainage pipe, with inlet and outlet ends, and a drainage valve connected to the inlet end of the drainage pipe. The drainage valve includes a water inlet periphery, defining a water inlet in fluid communication with the inlet end of the drainage pipe, and a connecting member disposed circumferentially around the water inlet periphery. The connecting member is radially spaced apart from the water inlet periphery. The connecting member may be formed by injection molding around the water inlet periphery.

At least some aspects of the present disclosure feature a convective device, comprising: a pneumatic structure formed by one or more layers, a partially detachable access duct, and a separation device disposed on a side of the partially detachable access duct. The partially detachable access duct in fluid connection with the pneumatic structure.

A flexible paint hose has a first end, a second end, and a continuous conduit wall extending from the first end to the second end. The continuous conduit wall has a cross-section absent of an edge, and a non-circular cross-sectional shape in a first state and a substantially circular cross-sectional shape in a second state.

A long tube formed of an elastic material includes: an upper portion including a printable upper surface; a lower portion facing the upper portion; a first side wall connecting the upper portion and the lower portion; a second side wall connecting the upper portion and the lower portion and facing the first side wall; a first upper joint portion located at a connection portion between the upper portion and the first side wall and configured to bend the first side wall with respect to the upper portion; a first lower joint portion located at a connection portion between the lower portion and the first side wall and configured to bend the first side wall with respect to the lower portion; and a first side wall joint portion configured to bend the first side wall.

A tube can include a sidewall defining a lumen profile. The sidewall can include a plurality of alternating thin regions and thick regions. The lumen profile can include a plurality of alternating large radius and small radius regions. The thin regions or large radius regions can include elastic instabilities adapted to form an essentially complete closure of the lumen profile at minimal compression.

A method of fabricating a conduit comprises steps of attaching a first first-tubular-outboard-ply-end of a first tubular outboard ply to a first inner collar portion of a first collar with a second weld and attaching a second first-tubular-outboard-ply end of the first tubular outboard ply to a second inner collar portion of a second collar with a fourth weld. The method also comprises steps of inserting a second tubular outboard ply into the first tubular outboard ply and inserting a tubular inboard ply into the second tubular outboard ply, so that the second tubular outboard ply is interposed between the tubular inboard ply and the first tubular outboard ply. The method further comprises steps of threadably interconnecting the first inner collar portion and a first outer collar portion of the first collar and threadably interconnecting the second inner collar portion and a second outer collar portion of the second collar.

In order to provide a sealing element which ensures a reliable seal and which can be produced easily and economically, it is proposed that a main body of the sealing element is formed from a partially fluorinated or fully fluorinated thermoplastic material which is injection-moldable.

A method of fabricating a fluid component body includes forming a monolithic fluid component body including a valve segment having an annular upper perimeter wall portion defining a valve cavity and a lower base portion defining first and second flow ports, and a conduit segment extending from one of the first and second flow ports and including a conduit end portion defining a tubular portion extending in a first direction and spaced apart from a remainder of the fluid component body. The conduit end portion is bent from the first direct to a second direction.

A modular fluid spray nozzle is constructed from an inner conduit, having a sidewall with a center hole, housed inside a center conduit that includes a window defined by a sidewall, and a flexible or rigid outer conduit wrapped around the center conduit and forming a chamber with the rectangular window. The chamber is in fluid communication with the center hole and with at least two apertures defined by the outer conduit. The inner conduit is configured to be coupled to any type of conduit material, such as PVC pipe or another modular fluid hose segment.

A tube is flexible, and includes a tubular outer peripheral surface and a tubular inner peripheral surface. The outer peripheral surface includes corner portions protruding outwardly. The inner peripheral surface includes first arcuate portions positioned inside the corner portions and having a radius of curvature greater than that of the corner portions. In the tube having such a shape, opposed portions of the inner peripheral surface are less prone to be close to each other when an external force is applied to the tube or when the tube is locally bent. This restrains an internal flow passage of the tube from being blocked.