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A plate flange (PL flange, flat flange) is a flat, circular forging with a central bore and a ring of bolt holes. Slip it over the pipe, weld both sides, and the line is sealed—no hub, no neck, just a flat flange that keeps installation simple and costs low.
Note: A plate flange has a bore and connects pipes; a blind flange (BL) has no bore and blocks flow—choose PL for connection, BL for isolation.