RooR Glass 18/18mm 13-Hole Bong Downstems

Take your smoking setup to the next level with the ROOR® Glass 13-Hole Downstem—a premium, high-performance bong downstem designed for smooth, ultra-clean hits. Handcrafted in California from lab-grade Duran Schott borosilicate glass, this precision diffuser is a functional upgrade for any serious smoker.

Engineered for Maximum Diffusion

The 13-hole diffuser tip is the standout feature—each hole is carefully blown into an evenly spaced pattern to maximize airflow and percolation. This design breaks smoke into smaller particles, promoting cooler, smoother inhales and more efficient filtration with every hit.

Whether you're upgrading an old downstem or building a high-end glass setup, this downstem for bong lovers provides the smooth diffusion you'd expect from the ROOR® glass legacy.

Built for a Perfect Fit

• 18mm outer joint – connects securely to your water pipe

• 18mm inner joint – fits all 18mm male glass bowls

• 13-hole diffuser tip – engineered for optimized airflow and filtration

• Made from 18mm diameter Duran Schott tubing

• White ROOR® logo – a mark of authenticity and style

• Available in a variety of lengths to suit your specific setup

Each ROOR downstem is measured in ¼-inch increments, from the top of the ground joint to the end of the diffusion tip, ensuring accurate sizing and a flawless fit.

Standard ROOR® Downstem Length Guidelines:

• Classic Straight Tubes: 3½" – 4"

• Classic Beaker Tubes: 5¼" – 6"

NOTE: We always recommend measuring your current downstem before ordering to ensure the perfect fit. Refer to our diagram in the listing for detailed instructions.

Product Features:

• 18mm to 18mm reducing fitment

• 13-hole diffuser tip for enhanced percolation

• Borosilicate glass – heat-resistant and durable

• Low-profile design for a clean aesthetic

• White ROOR® logo

• Made in California, U.S.A.

Why settle for average when you can smoke with precision?
Upgrade to the ROOR® Glass 13-Hole Downstem and experience unmatched diffusion, durability, and design. Whether you're a daily smoker or a glass enthusiast, this is the bong downstem that earns its place in your rotation.

Browse the rest of the RooR Glass collection here.

Added on June 10, 2020