Our gallon pump is great for dispensing shampoo, conditioner, sunscreen, massage oil, mouthwash, lotion, cream and soap, used by professional mom's and salon pros around the world for all their value sized product dispensing. Fits bottles with a 38/400 neck size or 1-3/8-inch neck diameter. Measure your bottle's neck before making a purchase to insure it is compatible. Not for use with epoxy products or applications, will not dispense epoxy liquids. Convenient, durable, sturdy and high quality pump screws that can securely fit onto most plastic and glass containers.