Please choose the correct ending to complete the given sentence: Health: [header] How to make a simple bong [title] Learn the basic structure of a water pipe. [step] Although certain forms and functions of water pipes may vary from model to model, many share common characteristics. Learning these commonalities can you help you better understand the process as you work to build your own water pipe.

Ending1: [substeps] A beer bong consists of a tube with 6 oz. ( 250 ml) of beer and the tube (black tinted or red metal mouthpiece) is the mouth. Ending2: Review the following three main features of a water pipe : [substeps] Chamber carburetor stem and bowl [title] Find the right chamber. [step] Search for a suitable chamber for your water pipe. Ending3: [title] Ensure that you are using a hazardous material. [step] Nothing is more dangerous in the end than accidentally drawing water, leading to injury. Ending4: [substeps] Simple tumblers are simple cylinders with round caps and metal bottoms. These tend to have a outside cap, not a plastic seal.

Answer format: ending1/ending2/ending3/ending4