For still water, the neck finish is the first fork in the road: it sets the cap, the closure cost and the filling line — so it pays to match it to your format up front.
The three water necks
29/25 is the single-serve water standard (light, low-cost cap). 48 mm suits large-format and sports formats. 55 mm is the 5-gallon / 19 L returnable. Each pairs with a specific closure and weight band.
Lighter is possible
Neck weight is fixed by the finish, but Delta offers lightweight variants on some water SKUs — small per-unit grams that compound across millions of bottles.
Find your fit
Filter by application and neck in the Product Finder to see the exact SKUs, weights and matching closures for your water format.