Measure the outside diameter of your rig's joint at the widest point with a ruler or caliper. The four common standards are 10mm (very small, used on compact rigs), 14mm (most common modern size), 18mm (larger, traditional and heady standard), and 29mm (oversized specialty). If you can't measure, compare to a US dime — 18mm is just slightly larger than a dime; 14mm is noticeably smaller. If you're still not sure, send a photo of the joint to the shop with a coin in frame for scale and we'll identify it. Joint size must be exact — there's no "close enough" with glass-on-glass connections.

Use a ruler or caliper on the outside diameter of the joint at its widest. For a male joint (sticks out as a tube), measure across the outside of the tube. For a female joint (recessed socket), measure across the inside opening of the socket. The measurement should land on one of the four standards: 10mm, 14mm, 18mm, or 29mm. If your measurement falls between standards, you almost certainly have an off-brand or imported piece — most major glass brands stick to the four standards. For accuracy, a digital caliper is ideal but a clear plastic ruler works.

Look at the joint. If a tube of glass sticks out from the rig — something else slides over it — it's male. If the rig has a socket recessed into it — something else slides into it — it's female. The adapter you need is the opposite gender of the rig on the rig-facing side, and the opposite gender of the attachment on the attachment-facing side. Most modern rigs are 14mm female; most older heady rigs are 18mm male. If gender is unclear from a photo, the easiest test is to try fitting a known male or female piece — whichever direction connects tells you the gender.

A reducer is an adapter that steps from a larger joint size to a smaller one. The most common use case is putting a modern 14mm banger or bowl on an older 18mm female rig — you need an 18mm male-to-14mm female reducer (18mm male fits the rig, 14mm female accepts the banger). Reducers are named in the direction of conversion: "18mm to 14mm" tells you the input side and the output side. Bear Quartz makes a 14mm to 10mm Reducer for the next step down — useful for compact 10mm rigs.

Yes — expanders work the opposite direction of reducers, going from smaller to larger. They're less common because the typical buying pattern runs the other way (older rigs are larger, modern attachments are smaller), but expanders are available. A 14mm rig that needs to accept an 18mm attachment uses an expander. The trade-off with expanders is that the smaller joint side becomes a flow bottleneck — drag through the rig increases when air has to pass through a smaller-than-attachment opening. For most use cases this is acceptable; for high-flow setups, consider whether the expansion is worth the drag.

The MJ Arsenal Proxy Attachment converts a Puffco Proxy — a palm-form electronic dab rig — into a glass attachment that fits a standard water pipe joint. The Proxy's heating element and atomizer sit inside the MJ Arsenal glass, which then connects to a water pipe via its joint. The result: the Proxy still runs as an electronic rig, but vapor now passes through water filtration in your water pipe before inhalation. Effectively turns the Proxy into a desktop water-rig with full e-rig functionality. It's the most-requested Proxy accessory after stock Puffco glass. For more on the Proxy ecosystem, see our Puffco Proxy collection guide.

If your rig has a 14mm joint and you want to use 10mm attachments, any 14mm-to-10mm reducer that matches your rig's gender will work mechanically. The variables are gender (14mm female reducers fit male rigs and vice versa), material (quartz reducers like the Bear Quartz 14mm to 10mm work well with quartz bangers; borosilicate reducers work with glass bowls), and angle (straight or 45°). The brand isn't critical — a 14mm-to-10mm reducer is a relatively simple piece of glass and most brands produce functional versions. Bear Quartz is recommended for quartz banger use specifically because the thermal match avoids stress on glass-on-quartz connections.

Yes, within standard joint sizes. The 10mm, 14mm, 18mm, and 29mm specs are universal — a 14mm female adapter fits any 14mm male rig regardless of brand. The exceptions are proprietary fittings: Puffco Proxy uses its own joint geometry, which is why you need a specific Proxy Attachment rather than a generic adapter. Some specialty bangers and rigs use slightly off-spec joints — usually imports or low-quality pieces. For named brands (RooR, Mothership, Illadelph, Mobius, etc.), the four standards are absolute. When in doubt, measure.

Yes, for ergonomics. A straight adapter keeps the attachment in line with the original joint angle. A 45° adapter tilts the attachment forward, useful on tall rigs where a straight banger sits at an awkward height for comfortable use. A 90° adapter positions the attachment perpendicular, mostly used in specialty rig configurations. For most setups, straight or 45° covers the need — 45° is the most versatile for dome-and-nail dabbing. Choose based on rig height and how the attachment sits when assembled. If you can't visualize it, mock the setup with cardboard before buying.

Slightly. Any additional joint connection adds a small flow restriction and creates a path where vapor can lose temperature. In practice, the effect is minor and most users don't notice it. Reducers (large-to-small) add more drag than expanders, since the smaller output side becomes a bottleneck. Ash-catcher adapters (Mobius Snap Trap) add more drag than plain adapters because the trap chamber adds air volume. For most dab and flower setups, the trade-off is worth the connection flexibility. For percolator-heavy rigs already at the edge of comfortable draw, consider drag impact when adding adapters.

Match the adapter material to the attachment when possible. For quartz bangers, a quartz adapter (Bear Quartz) is thermally matched and reduces stress on the connection during temperature swings. For glass bowls, glass adapters are standard. Mixing materials works — a glass adapter on a quartz banger is fine for normal dab temperatures — but extreme high-temp dabbing can stress mismatched joints over time. For long-term use with frequent torch heating, prefer material-matched joints when available.

The standard size adapters in this collection are for glass-on-glass connections — they don't apply to most electronic rigs, which use proprietary attachment systems. The exception is the MJ Arsenal Proxy Attachment, which specifically converts a Puffco Proxy to fit standard water pipe joints. For Puffco Peak Pro accessories, see the Puffco collection. For Focus V Carta accessories, see Focus V. For e-nail dome adapters, see E-Nails.