18mm to 18mm Downstems

What Is an 18mm to 18mm Downstem?

An 18mm to 18mm downstem features a male joint on one end and a female joint on the other, and both are 18mm in size. This type of downstem fits into a bong with an 18mm female joint and holds an 18mm male bowl or accessory.

While not as common as the 18mm-to-14mm setup, this size is perfect for those who prefer a larger airflow and want to keep everything in the same size category. If your bong and bowl are both 18mm, this is the exact downstem you need.

*  The 18mm to 18mm downstem is also referred to as 18mm by 18mm downstem or 18mm/18mm downstem.

Choose the Right Material for Your Session

At Smoke Meg, we know every smoker has different preferences—so we offer 18/18 downstems in a variety of materials to match your style and needs:

• Borosilicate Glass – Clean hits, classic feel, easy to clean.

• Metal – Ultra-durable and long-lasting, perfect for rough use.

• Perc Options – We even have glass downstems with tree-style percs to help filter and smooth your smoke.

Whether you want flavor purity, convenience, or cooling, we’ve got you covered.

Shop 18mm to 18mm downstems Online at Smoke Meg

With years of experience and direct partnerships with trusted factories, Smoke Meg delivers high-quality bong downstems at factory-direct prices. All our 18mm to 18mm downstems are designed to fit standard bong joints, giving you a perfect, airtight fit every time. Plus, every order is backed by our friendly and reliable customer support. And don’t forget: we offer free worldwide shipping on orders over $49!

General FAQ’s

Are all 18mm downstems the same length?

No. Length varies depending on your bong’s design. Measure from the bottom of the ground joint to where the downstem will sit inside the water chamber. We offer multiple length options to match.

Which material should I choose?

Glass is great for flavor. Silicone is unbreakable and travel-safe. Glycerin cools your smoke. Metal lasts forever. It all comes down to your style and priorities.