Abstract: An arch shape cross section thermoplastic leaching chamber, having sidewall slot perforations which flare inwardly, is made using a mold comprised of a mold cavity part and an inwardly retractable mold core part. The core part has opposing side slides with projections that define the perforations; they are separated by a center block. The center block moves downwardly and the slides move inwardly, under action of slide rods built into the mold core, to enable a molded chamber to be removed from the mold.

Abstract: A candle cover for use with light fixtures having at least one candle assembly. The candle cover has an elongated, translucent sleeve with a longitudinal bore therethrough which is dimensioned to receive the candle assembly. The sleeve has a length with sufficient dimension to extend the top portion of the sleeve above the screw shell of a light bulb when the sleeve is mounted on the candle assembly. This gives a distinctive glowing appearance to the candle cover, which is highly attractive.

Abstract: A leaching chamber has sidewall perforations which flare inwardly, so that the smallest perforation dimension is on the exterior surface of the sidewall. The basic axes of the perforations run downwardly toward the chamber base, as the axes run from the inside to outside of the chamber. Mold cores having inwardly retracting slides, and which move in complex ways, are used to form the chamber. Thus, perforations are present down near the base flange of the sidewall, even though the base flange has an upwardly extending fin.