1 Gallon Pump fits most 128 or 64-Ounce Lotion & Liquid Pump Top for neck size 1 1/2 wide. and 11 inches deep tube from neck of container to bottom. or also compared to 38/400 lotion pump 11 inch deep dispense your own liquid soaps, shampoos, massage oils, cleaning solutions, detergents, body washes & more & then easily fill smaller containers. can replace the need to purchase expensive hand sanitizer dispenser