Can a regular plastic female adapter fitting be used to transition from plastic to metal piping?
No. Plastic female adapters that are all-plastic should never be used as transitions from plastic to metal piping. In fact, you should never use any all-plastic female threaded fitting to transition to or from metal piping. The reason is because of large differences in tensile strengths and rates of thermal expansion/contraction between the two. The proper method to transition between plastic and metal is thru the use of special transition fittings. These special transition fittings are available in a variety of styles and configurations. Check with specific manufacturers on fittings that they recommend for use as transitions from metal to plastic. Be sure to check local codes concerning acceptable transition practices.
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