About Colonial Engineering
In 1972, Colonial Engineering began molding Sch 40/80 PVC & CPVC pipe-fittings. In 1984, we added plastic ball valves, butterfly valves and check valves to expand our capabilities in the industrial PVF, process piping, water treatment, pool/spa, commercial plumbing, and irrigation markets.
Colonial entered the Custom injection-molding business in 1985, building on the expertise gained from molding proprietary products in the valve and pipe-fitting market. Experience working with CPVC, PVC, PP, ABS, HDPE, Noryl, and other materials has enabled us to work with a variety of industries. In addition to injection-molding, we perform secondary CNC machining operations, hot stamp and pad print, and sub-assembly.
Colonial divested of our Sch 40/80 pipe-fitting product line in 2002. Since then, we have continued to grow in the custom-molding and plastic valve markets, with two production facilities in SW Michigan. Please contact us to assist with your next project requirements.

Colonial Engineering, Inc.
6400 Corporate Ave
Portage, MI 49002
Customer Service (toll-free):
800-374-0234
National order fax (toll-free):
866-879-5982 or 269-323-0630