Store › Grayl to 28mm Adapter Image 1 of 2 Image 2 of 2 Grayl to 28mm Adapter $7.00 This 3D-printed adapter will allow you to fit the standard tube and 28mm adapter to the lid of your Grayl Geopress Bottle! Quantity: Add To Cart Added! This 3D-printed adapter will allow you to fit the standard tube and 28mm adapter to the lid of your Grayl Geopress Bottle! Reviews Reviewer Name Review Date Star Rating Description Posted on Etsy Product Show More