Spiral Pipe & Fittings Stock G90 Round Spiral Pipe M&M manufactures Round Spiral Lockseam Pipe in diameters up 48" and maintains a large stock of inventory. 50" to 100" available on special order. Insulated Spiral Pipe Sections M&M can provide insulated spiral pipe per your specification. Spiral Pipe Stock Spiral Pipe is supplied in diameters ranging from 3" to 16" in 1" increments and from 18" to 48" in 2" increments. Larger diameters up to 100" can be manufactured upon special request. Large Elbows and Pipe © 2004 M&M Manufacturing. All Rights Reserved. Powered by