Sierra Exhaust Flapper 4" 18-4457
Sierra Exhaust Flapper #18-4457
- Size: 4". Complete with Stainless Steel Clamps.
- Premium Protector Valves for wet exhausts are made of 100% durable EPDM that is extremely resistant to UV light, ozone, heat, and weather aging. For salt or fresh water. It will give the boat's exhaust system dependable protection in any harsh marine environment.