DAPA Products, Inc. is the largest manufacturer of Screen Spline in the country. DAPA manufactures Foam, PVC & PE ribbed spline in stock sizes ranging from .120 - .270 diameters. DAPA also manufactures T-spline, Flat spline, Bug Flap and Glazing Channel as well as custom plastic extrusions on a custom order basis. These products are generally produced in black, but can also be produced in grey or white or other colors with minimum order amount requirements.