The design is the visual features of the COUPLING ELEMENT OF A PELT BOARD as shown in the drawings, whether those features are features of one of shape, configuration, ornament or pattern or are a combination of any of these features.Drawings of the design are included.In the drawings:Fig. 1 is a front perspective view of a COUPLING ELEMENT OF A PELT BOARD in accordance with said Industrial Design;Fig. 2 is a rear perspective view of the COUPLING ELEMENT OF A PELT BOARD;Fig. 4 is a front view of the COUPLING ELEMENT OF A PELT BOARD;Figs. 3 and 5 are views from opposite sides of the COUPLING ELEMENT OF A PELT BOARD shown in Fig. 4;Fig. 6 is a rear view of the COUPLING ELEMENT OF A PELT BOARD shown in Fig. 4;Fig. 7 is a top plan view of the COUPLING ELEMENT OF A PELT BOARD shown in Fig. 4; andFig 8 is a bottom plan view of the COUPLING ELEMENT OF A PELT BOARD shown in Fig. 4.