This pump is the Best Gallon pump i've used in 20 years grooming! 

• Dispenses 30ml(one ounce), in one stroke
• Top fits Gallon jugs. 
• nice big square head for easy use with soapy hands
• comes apart for easy cleaning & disinfecting
• made of sturdy plastic & metal springs
• Drip free on Viscous products.   the exception is for watery liquids. 

*note from Joanne: I have been looking for this pump forever! I have the exact same ones from mega years ago and they are my fav!