White Papers



The only one stop source for HDPE & PVC in both Solid and Corrugated wall.


Why choose Specified Fittings?

Specified Fittings was established in 1997 and produces one of the most complete lines of HDPE/PVC fittings in the industry.  We are the only company in North America that produces HDPE/PVC fittings in both Corrugated and Solid Wall.  Specifically in HDPE, we have you covered with Solid Wall from 3/4” to 63” and Corrugated from 4” to 60”.  Of special note is the fact that our exclusive line of HDPE Solid Wall products are FM Approved.

Because we are a manufacturing company, we have extraordinary flexibility in what we can produce, whether it be a "one off" fitting or 1000 fittings.  We can also custom build fittings to your individual specifications.  Just give us a drawing or dimensions and we can fabricate a fitting that will meet your exact requirements.  It is no mistake we are known as the “We Can Do It” company by our customers.

In addition to our own products, we offer a broad-based commodity line including injection-molded sewer, C907, SDR21 Gasketed, SCH40|80|80CPVC, and PVC DWV.

At Specified Fittings we strive to provide fast and efficient service to our customers.  We have two factories producing parts 24 hours a day, located in Bellingham, Washington and Stevensville, Montana.  Furthermore we distribute parts from our factory locations as well as eight strategically located regional warehouses throughout the country.

We have a comprehensive set of illustrated catalogs available on CD or downloadable from our website under products.  We designed our catalogs with customer needs in mind.  If you are trying to estimate costs or research a project, you will appreciate our attention to detail.  We provide helpful information on sizes and availability along with useful technical information.  If you need further assistance or prefer to talk to a helpful professional, please contact our friendly customer service staff.  We are available Monday through Friday, 6:00 AM to 5:00 PM PST at our Washington factory (360.398.7700) or 6:00 AM to 5:00 PM MST at our Montana factory (406.777.3466).


Over the years, with the acquisition of Professional Fiberglass, Norcor, Infutech, New Plastics, Quail Industries’ fitting equipment, Total Poly, KWH Pipe’s solid wall HDPE fitting division, Flangeman Marketing Inc and the current acquisition of Poly Warehouse, the guiding principle of the ownership of Specified Fittings to produce in-house the fabricated fittings and components we sell continues.


Headquartered in Bellingham, Washington with manufacturing plants in Bellingham, Washington; Missoula, Montana and warehousing in Preston, Idaho; Dallas and Lubbock, Texas; Springfield, Illinois; St. Louis, Missouri; Orlando, Florida; Kearney, Nebraska and Atlanta, Georgia, Specified is one of the largest fabricators of HDPE, PVC, CPVC and exotic plastics in North America, serving the municipal water and sewer, storm water, agricultural, industrial, mining, oil and gas, plumbing, golf, HVAC, environmental and road construction markets.

So why should you do business with Specified Fittings?  You get all of the aforementioned plus the convenience and support of a one-stop purchasing resource.  Call us today for a comprehensive quote and put us to work on your next project or purchase.

The staff of Specified Fittings