The neck finish is fixed long before the bottle is blown — it must match your filling line and closure. Two of the most common finishes on PET beverage lines are 29/25 (still water) and PCO 1881 (carbonated).
| Attribute | 29/25 | PCO 1881 |
|---|---|---|
| Application | Still water, no pressure | Carbonated soft drinks |
| Finish design | Light, short water finish | Global CSD standard; thread shorter than 1810 |
| Optimised for | Low cost, high-speed still-water filling | Saving resin while holding carbonation pressure |
| Matching closure | DEN-CLO-29_25_WATER | DEN-CLO-PCO_1881 |
| Choose when | Still water (or 30/25) | Carbonated soft drinks |
29/25 — still water
A light, short water finish optimised for low cost and high-speed still-water filling. Pair it with a lightweight 29/25 closure such as DEN-CLO-29_25_WATER.
PCO 1881 — carbonated
The global CSD standard. Its shorter-than-1810 thread saves resin while holding carbonation pressure, and it pairs with DEN-CLO-PCO_1881. Most of Delta’s CSD preforms — e.g. DEN-CSD-13-PCO1881 — use it.
How to choose
- Still water, no pressure → 29/25 (or 30/25).
- Carbonated soft drinks → PCO 1881.
- Already tooled for a closure? Match the finish to your existing caps and line change-parts.
Filter by neck in the Product Finder, or browse the full SKU reference table.