An assembly including a double wall PE sump and an electro-weldable penetration fitting, wherein the sump is provided with two walls identifying an interspace therebetween and wherein at least an electro-weldable penetration fitting is applied to the sump at at least a circular opening prepared for the passage through the two walls by a conduit. The penetration fitting includes a cylindrical sleeve internally defining a tubular passage and provided with a threaded portion on the outer surface of a first end, with a cylindrical portion on the opposite end, and centrally with a stop shoulder, as well as with a welding zone, having a heat transfer component, provided between the threaded portion and the stop shoulder. The penetration fitting also includes a locking ring at least provided with a smooth cylindrical portion that can be coupled with the welding zone of the cylindrical sleeve provided with the heat transfer component.

An assembly including a double wall PE sump and an electro-weldable penetration fitting, wherein the sump is provided with two walls identifying an interspace therebetween and wherein at least an electro-weldable penetration fitting is applied to the sump at at least a circular opening prepared for the passage through the two walls by a conduit. The penetration fitting includes a cylindrical sleeve internally defining a tubular passage and provided with a threaded portion on the outer surface of a first end, with a cylindrical portion on the opposite end, and centrally with a stop shoulder, as well as with a welding zone, having a heat transfer component, provided between the threaded portion and the stop shoulder. The penetration fitting also includes a locking ring at least provided with a smooth cylindrical portion that can be coupled with the welding zone of the cylindrical sleeve provided with the heat transfer component.

A reusable drywall air injector is fashioned from durable, rigid material. A pointed tip for piercing drywall extends from a hollow cylinder around which is disposed a helical blade. A hollow hex section is connected between the hollow cylinder and a hollow nipple, the interiors of the cylinder, the hex section and the nipple interconnecting to form a path for compressed air. Embodiments of the injector further fashion the interior of the hollow cylinder with notches adapted to receive a driver head. The injector is inserted into drywall by driving the injector by means of a motorized drill or screwdriver engaging the injector either by deep well socket around the hex section or, in embodiments, by appropriate driver head engaging the cooperating notches in the hollow cylinder. After use, the injector may be removed from drywall for reuse by the same means operated in reverse.

A reusable drywall air injector is fashioned from durable, rigid material. A pointed tip for piercing drywall extends from a hollow cylinder around which is disposed a helical blade. A hollow hex section is connected between the hollow cylinder and a hollow nipple, the interiors of the cylinder, the hex section and the nipple interconnecting to form a path for compressed air. Embodiments of the injector further fashion the interior of the hollow cylinder with notches adapted to receive a driver head. The injector is inserted into drywall by driving the injector by means of a motorized drill or screwdriver engaging the injector either by deep well socket around the hex section or, in embodiments, by appropriate driver head engaging the cooperating notches in the hollow cylinder. After use, the injector may be removed from drywall for reuse by the same means operated in reverse.

An adjustable escutcheon assembly is provided which can be installed flush against a ceiling, wall, or other surface where a supply pipe exits the ceiling, wall, or surface at various angles. The assembly includes a fitting having a curved bearing surface and an aperture for receiving the supply pipe, a retainer which bears against and is adjustable with respect to the curved bearing surface of the fitting, and an escutcheon plate mountable to the retainer. During installation, the retainer and escutcheon plate can be rotated with respect to the pipe and fitting in order to allow flush installation of the retainer and escutcheon against the ceiling, wall, or surface at a variety of angles.

A plumbing fastener, having a retaining ring to encircle a pipe and a fastener to lock the retaining ring around the pipe is described. The fastener is flush with the retaining ring. The plumbing fastener has a joint, including a T-joint, a post tab joint, or a Y-joint. In the T-joint, a male tab includes a T-joint tab received by a female slot. The T-joint reversibly locks the retaining ring around the pipe. In the post clip, the joint includes a post clip; a male tab includes a tongue. The post clip reversibly locks the retaining ring around the pipe. In the Y-joint, a male tab includes a Y-joint tab received by a Y-joint female slot. Fasteners may be an elastomer, a silicone, a rubber, a flexible plastic, or a flexible metal. Some rings have an interior ring surface with a flat cross-section. Other rings have a concave cross-section.

A plumbing fastener, having a retaining ring to encircle a pipe and a fastener to lock the retaining ring around the pipe is described. The fastener is flush with the retaining ring. The plumbing fastener has a joint, including a T-joint, a post tab joint, or a Y-joint. In the T-joint, a male tab includes a T-joint tab received by a female slot. The T-joint reversibly locks the retaining ring around the pipe. In the post clip, the joint includes a post clip; a male tab includes a tongue. The post clip reversibly locks the retaining ring around the pipe. In the Y-joint, a male tab includes a Y-joint tab received by a Y-joint female slot. Fasteners may be an elastomer, a silicone, a rubber, a flexible plastic, or a flexible metal. Some rings have an interior ring surface with a flat cross-section. Other rings have a concave cross-section.

A vehicular tube-holding device includes an outer holder mounted to a vehicle body, the outer holder having an inner holder fastening hole for insertion and fastening of an inner holder and a tube-fixing hole for passage of a tube; and the inner holder inserted into and fastened to the inner holder fastening hole in the outer holder to be in close contact with an outer-diameter portion of the tube.

A vehicular tube-holding device includes an outer holder mounted to a vehicle body, the outer holder having an inner holder fastening hole for insertion and fastening of an inner holder and a tube-fixing hole for passage of a tube; and the inner holder inserted into and fastened to the inner holder fastening hole in the outer holder to be in close contact with an outer-diameter portion of the tube.

A building is constructed by providing a subfloor and forming a hole in the subfloor. A hole protector includes a cylinder, a skirt disposed around the cylinder, and a cap disposed on the cylinder. The hole protector is disposed over the hole with the cylinder extending into the hole. The hole protector is fastened to the subfloor. The cap is removed from the hole protector. An MPE is disposed through the cylinder.