Welcome to Portage Specialty, a company built on trust, quality and innovation in fitting manufacturing. We John Guest Fittings operate as a supplier and manufacturer of compression fittings for plastic tubing. We provide solutions that simplify fluid and air connections. Our products are designed for strength, precision, and consistent performance, supporting everything from industrial systems to everyday applications. At Portage Specialty, we combine technical expertise with customer-focused service, ensuring you get the right fitting for every project. Email us: portagespecialty@att.net - Call us: (800)323-3864 - Location: 1499 Vanderbilt Ave, Portage, MI 49024, United States