The part numbers for original PS-1 are not the same as PS-2. But if you need a PS-1 coupler you are sent the PS-2 version by MTH. PS-1 won't fire on PS-2 or 3. But PS-2/3 do fire on PS-1. The O gauge PS-2 coupler is DD-0000032 for the 51mm length and DD-0000033 for the 44.5mm Length. G
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