Providing Quality Products for Equestrians Founded in 1989, our mission is to develop and manufacture quality equestrian products, fabricated from durable plastics. In 1991 we acquired our own manufacturing machinery and expanded our molding operations to include a wide range of products. Our operations are located in Porterville, California's central valley. The Endurequest name signifies both our growth and commitment to making durable, quality products. We produce more than 400 items through the process of rotational plastic molding. We are proud to be the premier provider of plastic feeding and utility products for the equestrian market.