Water pipes & bongs
by Black Leaf
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The Glass Bowl Cylinder with Glass Screen from Black Leaf is a borosilicate glass bowl with glass screen built right in — a permanent replacement for flimsy metal gauzes that clog, corrode, and need swapping out every few sessions. Available in 14.5mm and 18.8mm joint sizes, this glass bowl with glass screen slots straight into most standard water pipes and bongs. If you're ready to order a lasting upgrade for your setup, this is one of the simplest swaps you can make.
Grab a ruler or caliper and measure the inner diameter of your water pipe's female joint — the opening where the bowl sits. If it measures roughly 14.5mm across, go with the 14.5mm variant (SKU: HS1915). If it's closer to 18.8mm, pick the 18.8mm (SKU: HS1916). These are the two most common joint sizes on the market, so one of them will almost certainly fit your setup. Still not sure? Pull out your current bowl and check the ground glass section — 14.5mm joints look noticeably slimmer than 18.8mm ones. You can usually tell at a glance once you've seen both side by side.
| Specification | Detail |
|---|---|
| Brand | Black Leaf |
| Material | Borosilicate glass |
| Screen type | Fixed glass screen (built-in) |
| Joint sizes available | 14.5mm / 18.8mm |
| Joint gender | Male (fits female joints on water pipes) |
| Shape | Cylinder |
| Roll-stop | Yes — flat edge prevents rolling |
| Logo | Black Leaf branding on bowl |
| SKU (14.5mm) | HS1915 |
| SKU (18.8mm) | HS1916 |
| Feature | Glass Bowl with Glass Screen | Standard Bowl + Metal Screen |
|---|---|---|
| Screen lifespan | Permanent — lasts the life of the bowl | Needs replacing every 5–15 sessions |
| Taste | Clean, no metallic flavour | Can impart metallic taste when worn |
| Airflow consistency | Stays uniform — glass doesn't deform | Degrades as mesh warps and clogs |
| Cleaning | Soak in isopropyl, rinse, done | Replace screen entirely; clean bowl separately |
| Fragility | Glass screen can crack if dropped | Metal mesh is nearly indestructible |
| Ongoing cost | None — nothing to restock | Ongoing screen purchases |
Complete your setup with a matching Black Leaf downstem if yours has seen better days, or get a set of cleaning plugs and some isopropyl cleaning solution to keep this glass bowl with glass screen looking fresh between sessions. A decent ash catcher also pairs well — it catches debris before it reaches your water pipe, meaning less cleaning overall. Browse the Black Leaf bong accessories category or the water pipe cleaning section for everything you need in one go.
A glass bowl with glass screen eliminates the recurring cost and hassle of disposable metal gauzes entirely. If you've been smoking through a water pipe for any length of time, you already know the routine: buy a pack of brass or steel mesh screens, push one into the bowl, watch it clog with residue after a handful of sessions, prise it out, replace it. Repeat. It's fiddly, it's wasteful, and those thin metal screens warp and discolour fast. According to harm-reduction guidance from the EMCDDA, using clean, non-corroded equipment is a basic best practice for anyone using smoking devices — and a permanent glass screen makes that easier to maintain than a rotating supply of degrading metal mesh.
The Black Leaf glass bowl cylinder solves this by building the screen directly into the glass. It's a series of small glass nubs or a perforated glass disc fused into the bowl's interior. Nothing to replace, nothing to bend back into shape. Residue still builds up — that's unavoidable — but a quick soak in isopropyl alcohol and a rinse with warm water brings it back to clear. The airflow stays more consistent than with a metal screen too, because the glass openings don't deform over time. You get an even draw from the first session to the hundredth.
One honest limitation: the glass screen is obviously more fragile than a metal mesh. If you drop this bowl onto a hard floor, the screen can crack or snap off entirely, and unlike a metal gauze you can't just swap in a replacement. Handle it with the same care you'd give any glass piece. The roll-stop helps here — Black Leaf added a flat edge to the bowl's exterior so it won't roll off a table when you set it down. Small detail, but it's the kind of thing that saves you from buying a second one.
Using this glass bowl with glass screen takes about thirty seconds from unboxing to your first draw. Follow these steps to get the best performance from it:
This is one of the most repurchased glass accessories in our catalogue, and the reason is straightforward: once people try a glass bowl with glass screen, they don't go back to metal gauzes. We've had customers come back specifically for the 18.8mm version after trying the 14.5mm on a different piece — that's usually a good sign. The cylinder shape gives it a slightly larger bowl capacity than a standard cone-shaped head, so you can pack a bit more per session without it mounding over the top. The glass itself has a decent weight to it — not flimsy, not heavy. You can feel it's proper borosilicate when you hold it, not the thin soda-lime glass you sometimes get with no-name bowls.
The one thing we'd flag: if your water pipe has a non-standard joint angle (some bent-neck designs use odd angles), make sure the bowl sits upright enough that your herbs don't slide out. On a straight-tube bong or a standard beaker, it's a non-issue. On a heavily angled piece, test the fit before you pack it. If you're looking to buy a replacement bowl that genuinely lasts, this is the one we hand people across the counter first.
Glass screens don't corrode, warp, or impart a metallic taste. They're fused into the bowl permanently, so there's nothing to replace. The trade-off is that if the glass screen breaks, the whole bowl needs replacing — but with normal handling, that shouldn't happen.
If your bong or water pipe has a standard 14.5mm or 18.8mm female joint, yes. These are the two most common sizes globally. Measure the inner diameter of your joint opening to confirm before ordering.
Soak the bowl in 90%+ isopropyl alcohol for 20–30 minutes, then rinse with warm water. A pipe cleaner works well for any residue stuck between the screen's openings. Avoid using sharp metal tools — they can chip the glass.
Borosilicate glass handles heat and thermal shock far better than standard soda-lime glass. It's the same type used in laboratory equipment and quality kitchen glassware. It's still glass though — drop it on tiles and it'll break.
It's a small flat section on the outside of the bowl that prevents it from rolling when placed on a flat surface. Sounds minor, but round glass bowls love to roll off tables. This stops that.
Yes — if your bong is 18.8mm but you're using a 14.5mm downstem (with a reducer), pick the 14.5mm bowl. The bowl needs to match the downstem's joint size, not the bong's main joint.
A medium grind is the sweet spot. Too fine and small particles pull through the glass screen into your water. Too coarse and airflow gets restricted, giving you an uneven burn.
Last updated: April 2026
