Male NPT is denoted commonly as either MPT or MNPT
Female NPT is either FPT of FNPT
FNPS refers to National Pipe Straight Mechanical thread and is normally compatible with MPT fittings
Pipe thread sizes do not refer to any physical dimension. Reference measurements to the table below, or try mating with a known pipe size before ordering.
NPT Size
Thread Diameter OD of MPT (ID of FPT will be slightly less than this.)
These warnings are not an indication that these products are violating any safety standards or regulations.
However, as our products might be sold in the state of California, we are legally obliged to inform customers about the potential presence of these chemicals in our products.
