3pdt= 3 pole double throwi'm assuming your wah has an in-use LED? otherwise, you'll only need a DPDT swich (double pole, double throw) which are easier to come by.if you need the 3pdt, i think i've seen a few being sold new on ebay. good luck.....
Electro Harmonix 3PDT switches (true bypass) here:http://www.hotroxuk.com/store/erol.htmlYou need to scroll down to Guitar Effects, then Electro Harmonix and its in there.Is this what you are after?