Three female and one male purification board

The three mother one formula purification board is a type of manual purification board, with three side keels in a concave shape and one side keel in a convex shape. During installation, the concave and convex keels are inserted and installed without the need for aluminum alloy connection. It has the characteristics of high strength, fast installation, and low cost of installation accessories, making it a commonly used version for manual purification boards.