TMG manufactures various sized helical underpinning pipe. Helical pipe can be ordered with single, double or triple helixes, with 8", 10" or 12" blades (or a combination of each). The helical pipe is made of 2.875" or 3.5" O.D. schedule 40 or schedule 80 pipe with two bolt holes and an outer nipple connector. Helical extensions are also available. Standards lengths are 4', 5', 6' and 7'. Custom lengths and designs are available. Optional powder coating or galvanization available.