Universal Roller Skids from CPI Products fit most push cameras and are designed to improve performance and protection in pipes from 3 to 16 inches in diameter. According to the manufacturer, using a plastic roller skid can protect a push camera from debris inside pipes and keep the lens from impacting pipe walls. A properly sized and fitted roller skid also keeps the camera centered for an improved image. 413-443-0925; www.cplasproducts.com.