... 3.High QA/QC system 4.OEM/ODM welcomed valve seal for water features:1. Materials advice: silicone and rubber (EPDM, ... NR, etc),as your request , Environmental Friendly.2. Application: automotive, machinery, bathroom facilities, household electrical appliances etc.3. Certifications: All manufacturing ... A or IRHD, tolerance can be ±5 shore A, for some special products, we can reach ±3 shore A tolerance ...