Integy RC Model Hop-ups C23519BLUE Engine Exhaust Silicone Seal for 1/8 Nitro Engine (21 and Larger) Genuine Integy Parts Ship Fast Direct From Our US Warehouse Top-Quality Materials & Superb Craftsmanship Preferred by Knowledgable Model Hobbists & R/C Enthusiasts Most Orders Processed Same Day. Reliable & Fast Shipping With Tracking Number Check The Manufacturer's Support Website For Cross-Reference Part Search