This is the one I've used for several years. I got mine from butcher-packer.com.
They still have the best price on this particular brine pump. It's also available from Allied-Kenco and Jack's Old South for about $180.
It's not cheap but is very high quality, food grade, parts are available like "O" rings, hoses, canulas, etc. I've used it for competition and many cooks for 200-400 people.
Southern Brethren BBQ Competition Team
"It's all about getting paid!" - Myron Mixon
"I love being hated in my hometown!" - David Hair
KingFisher Gator Rotisserie cooker, WSM, Stainless 5 burner with IR gas grill, Turkey Fryer, Weber JD Commemorative grill, slightly used Bandera chamber for future use as a cold smoker, Masterbuilt 40" insulated ELECTRIC smoker