https://www.HotDrillScrews.com/bonded_neoprene_washers.htm have a very large inventory of bonded neoprene sealing washers and epdm washers.
website:https://www.jhmindustry.com/
Shanghai Jian & Mei Industry and Trade Co., Ltd. is the company which manufacture and export fasteners and metal hardware, founded in 2006, with import-export authority. Now, 80% products export to all over the world and 20% sell in domestic market.