Piston Gravity Bong

Piston Gravity BongMJ Arsenal Piston Gravity Bong The Piston is MJ Arsenal's take on the gravity bong format, built entirely from handmade borosilicate glass. Where a standard gravity piece relies on a basic chamber and slide, this one adds a disc percolator inside the core, so the gravity assisted draw passes through diffusion before it reaches you. The result is a gravity bong that filters more than it typically would, without adding complexity to the format. The

The Piston is MJ Arsenal's take on the gravity bong format, built entirely from handmade borosilicate glass. Where a standard gravity piece relies on a basic chamber and slide, this one adds a disc percolator inside the core, so the gravity-assisted draw passes through diffusion before it reaches you. The result is a gravity bong that filters more than it typically would, without adding complexity to the format.

The piston architecture is the defining physical feature here. The glass core sits inside the glass shell and moves like a piston, with a silicone gasket creating the seal between the two. That gasket is included and does the work that glass-on-glass alone can't do in this kind of moving assembly. The 14mm slide is removable and standard-sized, so it's replaceable through any supplier carrying MJ Arsenal parts or compatible 14mm accessories. At 8.75 inches tall with the bowl attached and 3.5 inches wide, it's a compact unit that doesn't take up much shelf or storage space.

This is a handmade piece, so expect the minor variation in finish that comes with that process. The disc perc inside the core is what sets this apart from MJ Arsenal's other gravity formats; it's not a feature found on their standard gravity bong lineup.

• Material: 100% borosilicate glass, handmade
• Dimensions with bowl: 8.75" x 3.5"
• Dimensions without bowl: 7.75" x 3.5"
• Packaging dimensions: 9.5" x 8.5" x 4.25"
• Joint size: 14mm
• Percolator type: disc percolator

• Piston glass shell
• Piston glass core with disc perc
• 14mm glass slide
• Silicone gasket

• The silicone gasket is the seal between the shell and core; keep it clean and seated properly for consistent draw performance.
• The 14mm slide is a standard size, making it straightforward to replace if it breaks.
• Handmade construction means small cosmetic variations between units are normal, not defects.
• The disc perc is built into the glass core, not a separate removable insert, so cleaning the core is how you maintain the percolator.