PHBG 9538 Motorcycle Carburetor Manual and Automatic Pull Choke Starter.Compatible with PHBG 17.5AD, 19DS, 21AS, 21BS, 19/21CS, PHBL, and PHBH carburetors. Manual fitment includes: R2557 PHBG 21AS, R2517 PHBG 15AS, R2519 PHBG 16AS (4-stroke), R2571 PHBG 20AS, R2518 PHBG 15AS, R2507 PHBG 18AS, R2505 PHBG 18AS, R2506 PHBG 19AS, R2527 PHBG 20AS, R2508 PHBG 15BS, R2523 PHBG 18BS, R2509 PHBG 20BS, R2671 PHBG 21BS, R2522 PHBG 19BS, R2633 PHBG 21CS with oil feed, R2575 PHBG 19CS, R2674 PHBG 20DS. Automatic fitment includes: R2585 PHBG 17.5AD, R2599 PHBG 21AS, R2665 PHBG 21BD, R2695 PHBG 19DS Racing, R2696 PHBG 21DS Racing, R2912 PHBG 21DS Racing Red, R2631 PHBG 19DS, R2632 PHBG 21DS with oil feed. Material: Rubber and aluminum. Net weight: 21 g. Gross weight: 30 g. Package dimensions: 13 × 11 × 3 cm. Package contents: 1 × carburetor choke. Fits PHBG-series carburetors requiring manual or automatic pull-type choke.