These black lotion pumps will fit our 4 oz, 16 oz, and 32 oz backbar and bulk bottles.
For the 4 oz bottle (100 g of oil) select the 24-410 neck with 4 3/8" dip tube
For the 16 oz bottle (400 g of oil) select the 28-400 neck with 6 5/8" dip tube
For the 32 oz bottle select the 28-410 neck with 9 1/4" dip tube