GEAR 14/19 Up Size Interchanger Save Liquid error (product-badge line 32): Computation results in '-Infinity'% $8.70 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Have a 19mm Bong and only a 14mm bowl? Well here is the thing you need!! This handy little device will take the 19mm stem to a 14mm stem to fit the 14mm bowl!