DC jack-quick question

[frkystyly36]

what size DC jack should i use for effects?  Ive got one of those boss adapters, but as i cannot find it now, i dont know waht size to use...

thanks

[KORGULL]

2.1mm - like this one:http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&pa=151589CX&productId=121952
It will accept the same plugs as Boss pedals.