Genuine Efco Chainsaw Oil Pump Worm Gear 50050025R

Fits the following Chainsaws

136 | 136s | 137 | 140 | 141s | MT3700 | MT371 | MT3710 | MT4000 | MT4100 | MT411 | MT4110 | MT451 | MT4510

(3/8″ Low Profile Chain)