We are looking for a custom pump manufacturer who can make a 28/410 foaming pump for us that does not include an air return hole. We have been using an off the shelf pump and have experienced consistent leakage issues that we have traced to this hole. I am happy to provide schematics and photos upon request.
Pump:
Color: White
Neck Finish: 28/400
Weight: 14g
Total weight: 25g
Quantity:
30ml bottle Pump: 1,800,000 per year (150k / month)
60ml bottle Pump: 900,000 per year (75k / month)