When it , due to the slight projection of the edge of the panels, the stagnant water is not drained in time, and the mud in the stagnant water precipitates to soiling the edges or the corners of the modules. The accumulation of dirt in the panels edge or in the corners, can have dramatic consequences on the proper functioning of the photovoltaic system, it reduces photovoltaic panel power generation, and will form hot spots effect, reducing the service life of panels. The PV panels water drained clip is a self-fastening clip, made of plastic. types: 35 mm, Clasped the water clip to the bottom edge of the PV panel,the stagnant water will flows , there is no fouling again. How to install:First, make the whole surfaces of the PV panels clean, and clasped the water clip to the bottom edge of the panels , and don't tilt it, so it is ok, if it again, there will be no mud zone. In order to prevent stepping on the panel glass, you can use the photovoltaic panel protection mat. Notice:If the solar panel already has sludge, it must be cleaned before installing this product. This product only reduces the generation of new sludge belt. Colour:black Material:plastic Size:35mm Package Contents: 30x Side Water Drainage Clips Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.