GARD-N-POST D-N-POST Low profile support for use with outdoor light fixtures. Low profile supports just for 2 and 3-wire fixtures Installing an outdoor light fixture is easier and less expensive with Arlington's low cost Gard-N-Posts. The GPLN series low profile support is designed for 3-wire light fixtures. They come with a 3/4 inch NPT threaded opening and an installed 3/4 x 1/2 non-metallic reducing bushing for use with 1/2 or 3/4 inch NPT fixtures. Installed cover. Permanent colours, no chipping. Heavy-duty, resists damage from lawn mowers and other lawn maintenance equipment. UV rated plastic for long outdoor life.