Standard Sparge Faucet: $7.99
This is the same faucet that is attached to the sparge vessel. It can be used to convert MOST coolers with a removable drain into a sparge vessel. If you're fly sparging, I recommend this faucet. The flow rate is fast enough and easy to fine-tune.

Ball-Valve Faucet: $12.99
Because of its higher flow rate than the standard faucet, batch spargers may want to consider swapping the ball-valve faucet into their mash tun. Just add $5.00 to the price of the mash tun.