250057 O‑Ring – DIN 3771‑18×2.5 – FPM 75 – Rotax Exhaust Systems Precision-engineered to the DIN 3771‑18×2.5 standard and moulded from FPM (Viton®) with 75 Shore A hardness, this genuine Rotax part 250057 is the critical seal used in the exhaust port assembly of … Read More