Just FYI - the auction description says "reduced port" which means that they do not have a 1/2" full flow opening through the ball. Not necessarily a problem, but if you are trying to optimize flow rate for whirlpooling or something, this may or may not affect your results.
Surf City Brewing (TM)
My Single Tier, 3 Pump, BCS-462, Brutus Build:..... [LINK]
My customized BCS-462 controller web interface:.. [LINK]
My 8 tap, 11 keg, upright Keezer build:.................... [LINK]