Diffusers

At Grasscity.com we offer a wide range of diffusers. We have diffusers that serve as a connector for your bong and complete downpipes (stem with bowl). Diffusers cause an air whirl and produce little bubbles that cool the smoke. A downright innovation for a smooth smokin' experience.
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  1. Mad Scientist Adapter with Diffuser

    Mad Scientist Adapter with Diffuser

    List Price: $6.46

    Our Price: $5.49

    You save: $0.97

  2. Pearl Adapter 18.8
  3. Pearl Adapter 18.8 > 14.5
  4. Weed Star Slit Hole Diffuser Downstem - 29.2mm > 18.8mm

    Weed Star Slit Hole Diffuser Downstem - 29.2mm > 18.8mm

    Price: $22.69

    A spare or replacement diffuser downstem from Weed Star!
    • Quality borosilicate glass

    • Large inside-cut 29.2mm > 18.8mm joint

    • Weed Star logo in blue

    • 21 flame-polished piercings for extra bubbling and diffusion
    Learn More
  5. Weed Star - Pearl Diffuser Downstem - 14.5mm

    Weed Star - Pearl Diffuser Downstem - 14.5mm

    Price: $13.99

    A spare or replacement diffuser downstem from Weed Star!
    • Quality borosilicate glass

    • Sure ground glass-on-glass 14.5mm > 14.5mm joints

    • Weed Star logo in blue

    • Flame-polished piercings for extra bubbling and diffusion

    • Choose length when ordering
    Learn More
  6. Weed Star - Slitted Diffuser Downstem - 18.8mm

    Weed Star - Slitted Diffuser Downstem - 18.8mm

    Price: $12.99

    A spare or replacement downstem, from Weed Star!
    • Quality borosilicate glass

    • Sure ground glass-on-glass joints

    • Weed Star logo in blue

    • Slitted for extra bubbling and diffusion
    Learn More
  7. Weed Star - Circ Perc Downstem Bong Adapter - 29.2 mm > 18.8 mm

    Weed Star - Circ Perc Downstem Bong Adapter - 29.2 mm > 18.8 mm

    Price: $19.52

    A spare or replacement diffuser downstem from Weed Star!
    • Quality borosilicate glass

    • Inside-cut 29.2mm > 18.8mm joint

    • Weed Star logo in blue

    • Shower head diffusion for extra bubbling

    • Choose length when ordering
    Learn More
  8. Weed Star - 4-arm Diffuser Downstem

    Weed Star - 4-arm Diffuser Downstem

    Price: $32.50

    A spare or replacement diffuser downstem and adapter from Weed Star!
    • Quality borosilicate glass

    • Inside-cut 29.2mm > 18.8mm joint

    • Weed Star logo in blue

    • 4-arm slitted tree perc diffusion for extra bubbling



    This tree-perc downstem is extra long, so remember to check if it will fit your pipe! Learn More
  9. Magic Glass - Quattro 4-arm Downtube Adapter for Quattro Bong

    Magic Glass - Quattro 4-arm Downtube Adapter for Quattro Bong

    Price: $91.38

    Spare or replacement downstem for the Magic Glass Quattro bong!
    • Handmade in Germany

    • High-quality Schott Duran borosilicate glass

    • Sure-ground 45mm glass-on-glass main joint

    • 4 arms reinforced with colorful, unique glass marble

    • Large funnel bowl in matching joint size

    • Magic Glass logo

    • Choose joint size when ordering



    All Magic Glass pieces are made upon request and will be shipped within 3 to 7 business days of your order.
    Learn More
  10. Blaze Glass - Removable 5-Arm Tree Percolator 18.8mm

    Blaze Glass - Removable 5-Arm Tree Percolator 18.8mm

    Price: $25.50

    A removable 5-arm perc that changes color as you use it!
    • Reinforced

    • Color-changing silver fumed glass

    • Can be interchanged with any other 18.8mm removable perc
    Learn More
  11. Blaze Glass - Removable Single Coil Spiral Percolator 18.8mm

    Blaze Glass - Removable Single Coil Spiral Percolator 18.8mm

    Price: $18.50

    Color-changing removable spiral perc!
    • Quality borosilicate glass

    • Reinforced 18.8mm male joint

    • Color-changing silver fumed glass

    • Can be interchanged with any other 18.8mm removable perc
    Learn More
  12. Removable "Honey Comb" 7-arm Tree Percolator

    Removable "Honey Comb" 7-arm Tree Percolator

    List Price: $32.50

    Our Price: $27.63

    You save: $4.87

    Removable 7-arm Tree Percolator

    • Spare part for the Mad Scientist V3

    • Reinforced with glass between each arm


    Learn More
  13. EHLE. Glass - Diffuser Downstem

    EHLE. Glass - Diffuser Downstem

    Price: $32.69

    Handmade glass diffuser downstem from EHLE!
    • Made in Germany

    • High grade Schott Duran borosilicate glass

    • Pinpoint precision fit

    • Choose joint size and length
    Learn More
  14. ROOR - Glass Pearl Diffuser Downstem

    ROOR - Glass Pearl Diffuser Downstem

    Price: $50.19

    ROOR's pearl diffuser downstem for a smooth toke!
    • Made in Germany

    • High quality Schott-Duran glass

    • ROOR logo in white

    • Choose joint size and tube length

    Learn More
  15. G-Spot Glass - Diffuser Downtube

    G-Spot Glass - Diffuser Downtube

    Price: $26.66

    A diffuser downstem from G-Spot!

    • Made in Germany

    • G-Spot logo in black outline on top joint

    • Sealed and pierced end

    • Choose joint size, then length
    Learn More
  16. Glass Diffuser Downstem with Bowl - Choice of 5 colors

    Glass Diffuser Downstem with Bowl - Choice of 5 colors

    Price: $137.50

    Inside out slitted diffuser downtube with worked stem and bowl!
    • Made in the USA

    • Made from high-quality borosilicate glass

    • Choose 11.5cm, 14cm or 16cm length

    • Choose color combination: aqua/black/white, black/white, green/black/white, multi-color or rasta



    All American Glass Works items are made to order and will dispatch within 3 to 7 business days. Learn More
  17. Blaze Glass - Diffuser Adapter Downstem - 29.2mm > 18.8mm

    Blaze Glass - Diffuser Adapter Downstem - 29.2mm > 18.8mm

    Price: $29.25

    A 4x4 diffuser and adapter in one!
    • Inside-cut glass-on-glass joint

    • Downstem length: 15.5cm / 6.1 inches

    • Blaze Glass logo in high-gloss silver

    Learn More
  18. Weed Star - Honeycomb 6-arm Diffuser Downstem

    Weed Star - Honeycomb 6-arm Diffuser Downstem

    Price: $19.50

    A spare or replacement honeycomb diffuser downstem from Weed Star!
    • Sure ground glass-on-glass 18.8mm > 18.8mm joints

    • Weed Star logo in blue

    • Six slitted and reinforced arms in honeycomb shape

    • Downstem length: 12.5cm
    Learn More
  19. Black Leaf - Inside-Cut Shower Head Perc Diffuser Downstem

    Black Leaf - Inside-Cut Shower Head Perc Diffuser Downstem

    Price: $17.50

    Add shower perc diffusion to any set-up, available in various lengths!
    • High-quality borosilicate glass

    • Sure ground inside-cut glass-on-glass joint

    • 10-slit circular percolator

    • Black Leaf logo

    • Choose downstem length when ordering


    Learn More
  20. G-Spot Glass - Diffusor Rings

    G-Spot Glass - Diffusor Rings

    Price: $18.98

    Get bubbly, cool, filtered smoke with G-Spot's diffusion rings!
    • Reusable and easy to clean

    • Choose 10mm diameter (not for ice bongs) or 6mm diameter

    Learn More
  21. 2K Diffuser Beads - Choice of 9 colors

    2K Diffuser Beads - Choice of 9 colors

    Price: $17.50

    Diffuser beads for your bong that cool down smoke and make hundreds more bubbles!
    • Jar of 500-600 beads

    • Bead diameter is 6mm / .25 inches

    • Reusable and easy to clean

    • Cap with ash poker underneath

    • Choose from several colors, as available
    Learn More
  22. Blaze Glass - Shower Perc Diffuser Adapter Downstem - 29.2mm > 18.8mm

    Blaze Glass - Shower Perc Diffuser Adapter Downstem - 29.2mm > 18.8mm

    Price: $33.75

    A frosted glass shower perc diffuser and adapter in one!
    • Inside-cut glass-on-glass joint

    • 10-slit circular percolator

    • Downstem length from joint to perc: 12cm / 4.7"
    Learn More
  23. Weed Star - Removable Dome Perc with Piercings - 18.8mm Male Joint

    Weed Star - Removable Dome Perc with Piercings - 18.8mm Male Joint

    Price: $13.23

    Interchangeable bong perc for mix and match fun!
    • Sure ground glass-on-glass male joint

    • Blue glass loop at top for easy maneuvering with metal hook

    • Fits Weed Star's Mahony and Mad Professor 2.0 (not 3.0)

    • Fits any removable perc bong with 18.8mm female joint

    Learn More
  24. Alex K Glass - Showerhead Diffuser Downstem - 18.8mm

    Alex K Glass - Showerhead Diffuser Downstem - 18.8mm

    Price: $46.00

    Handmade, high-end glass diffuser downstem by Alex K!
    • Made in the USA in Minneapolis, Minnesota

    • Ships from the USA

    • High quality borosilicate glass

    • Sure-ground glass-on-glass joints

    • Alex K Black Label logo

    • Choose length when ordering

    Learn More
  25. Black Leaf - Inside-Cut Vortex Diffuser Downstem

    Black Leaf - Inside-Cut Vortex Diffuser Downstem

    Price: $18.75

    Adds powerful diffusion, available in various lengths!
    • High-quality borosilicate glass

    • Sure ground inside-cut glass-on-glass joint

    • 10-slit Vortex percolator

    • Black Leaf logo

    • Choose downstem length when ordering


    Learn More

Items 1 to 25 of 27 total

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