Yes, it is possible and is a very common practice. There are various fittings available with our
manufacturing partners that allow you to make that transition.
Please refer to NFPA section 188.8.131.52 – When nonmetallic pipe is used in combination system
utilizing steel piping internally coated with corrosion inhibitors and nonmetallic piping, the steel
pipe coating shall be investigated for compatibility with the nonmetallic piping. Reference FM
Approvals for more information: http://www.fmglobal.com/assets/pdf/fmapprovals/1635.pdf