Best Replacement Ball Valve

[Neptune]

So I want to replace some valves on a few guns. I was wondering if anyone has mccmasters for parts (They have a ton of useful stuff that can pertain to our hobby)

http://www.mcmaster.com/#ball-valves/=kry0ex

Here's a list of ball valves, and even after that more lists to get specifics.

[SEAL]

Some of those look pretty useful, but most ball valves that I've seen are much too big for stock water gun internals. The ball valve in my MD 6000 is about as big as my thumb. If I could find ones of that size in stores, I would have had a working CPS 12K since last spring, haha.

Some of those might be useful for homemades though; such as the motorized ones...

[Neptune]

Well, with 1/8" or 1/4" ball valves they're pretty small still