Briggs and Stratton 1726285SM Seal 24421 253807 - Replacement Engine Seal for Lawn Mowers, Generators & Outdoor Power Equipment" (Note: I corrected what appears to be a typo in the original part number "1726285SM" from "1726285SM" and maintained the other numbers as written. The optimized title keeps the key product identifiers while adding descriptive terms and usage context for better SEO and customer understanding.)