A plunger rod includes: an elongated body formed by a plurality of orthogonally spaced elongated ribs extending along a longitudinal axis； a first ledge adjacent a first end of the elongated body； a second ledge adjacent a second end of the elongated body； and an attachment portion extending from the second ledge. The second end of the elongated body opposes the first end of the elongated body. At least one elongated rib includes a retaining anchor positioned adjacent the second end adjacent the second ledge.
