Profile: Grotenrath Rubber Products Co., Inc. is a manufacturer of rubber products. Our products include O-rings, extruded solid & sponge rubber, TEFLON® molded or machined, lathe cut & die cut washers and injection molded rubber. Our O-rings are used in aerospace, automotive, hydraulic & pneumatic, critical sealing, medical, semi-conductor, military, industrial equipment and appliances. Our brands include Parker™.