This straight tube is a 2 part modular so that the mouthpiece section and also the center chamber can be switched out.

This tube has a solid fixed downstem with a 18mm grinding and a matching 18mm coloured push bowl.

The center chamber joins to the base with a male 45mm grinding going to a 45mm female grinding on the base.

The mouthpiece section is then joined to the center by another 45mm male grinding.

Be careful picking this bong up, the pieces all come apart quite easily.