The wiper seal set for the Wallace & Tiernan M135, Evoqua part number W2T504943. These are the seals the wiper rod passes through, and they are the parts that keep the reactor watertight while still allowing the rod to move. They are a routine consumable: every wiping stroke works them, so they harden and take a set with age, and a weeping wiper gland is normally cured by renewing the seals rather than by replacing the rod. Supplied as a set; the matching rod is item 4157-0116, Evoqua W3T164602. Wallace & Tiernan is an Evoqua Water Technologies brand, and was part of Siemens Water Technologies before that, so the same equipment is catalogued under all three names and its parts carry Evoqua W3T/W2T and legacy AAC/AAD numbers. Item number 4158-0116. Original part number W2T504943. Supplied by cBallast on quote-to-invoice terms; lead time and freight are quoted per RFQ against the destination Incoterm.