HIPA I.D x O.D: 0.680" x 0.912" Primer Bulb 188-13 for HDA and WYK Carburetor Engine Replace manufacturer part number: 188-13, 188-13-1 I.D. x O.D. x HT: 5/8" x 7/8" x 13/16" Fits HDA adn WYK carbs, refer to the despriptions below