A glass bong stem is one of those parts that makes a bigger difference than most people expect — the right fit means a proper seal, better filtration and a cleaner draw. The wrong one means air leaks, loose fittings and a frustrating session. We stock glass stems in bonza, standard 14mm and 18mm fittings, in lengths from 7cm to 18.5cm, from The Bong Shop, Planet X, Waterfall and EHLE. All delivered in discreet plain packaging anywhere in Australia.

Shop Glass Stems by Fitting Type

Three distinct fitting types in this range — getting this right is the most important step:

• Bonza glass stems — the most common fitting for Australian bongs. Bonza stems use a rubber grommet seal and are compatible with most standard Australian acrylic and glass bongs from Waterfall, Planet X and The Bong Shop. Available in 7cm, 8cm, 9cm, 10cm, 14cm and 16cm lengths. Both standard bonza stems and bonza slider stems with attached cone pieces are available.
  
  
• Standard 14mm glass slider stems — glass-on-glass 14mm stems for bongs with a 14mm joint. The slider design means the stem pulls out when you clear the bong, rather than using a carb hole. Comes with a cone piece attached. Available in 10cm length.
  
  
• 18mm glass slider stems — glass-on-glass 18mm slider stems for larger jointed bongs. Available in multiple lengths. Compatible with most 18mm joint glass bongs.
  
  
• Bonza-to-standard conversion stem — converts a bonza grommet hole to accept a standard glass cone piece. A useful piece if you want to upgrade from a bonza-style setup to glass-on-glass without replacing your bong.
  
  
• Glass diffuser stems — bonza fitting stems with diffuser slits at the base. The slits break smoke into smaller bubbles before it hits the water, giving you noticeably smoother and cooler draws compared to a standard stem. Available in 7cm and 9cm bonza sizes.

Not Sure Which Glass Stem Fits Your Bong?

The three things to check before ordering are the fitting type, the length and the joint size. Bonza fittings suit most Australian standard bongs — if your bong has a rubber grommet hole, you need a bonza stem. Glass-on-glass bongs use either 14mm or 18mm joints — check the joint opening on your bong before ordering.

For length, measure your existing stem from the base of the grommet or joint to the tip. If you're still unsure, get in touch and we'll help you find the right match. Browse our full bong stems range for metal and alloy options alongside glass.