Compatible with Briggs & Stratton 300E, 450E, 500E, 550EX Primer Engines (with red primer bulb), replacing OE# 593261, 799583, 591160, 591979, 595656, 84001982. Fits Craftsman M110/M230/M400, Poulan Pro PR450N20S (961120130-02), Troy-Bilt TB110 (Primer version), Yard Machines 11A-02BT729, Murray M20300, and more.
