The question under every sex-machine purchase: will the stuff I already own work on it, and what do I actually have to buy. The answer is simpler than the listings make it look — once someone tells you what the connectors actually are.
the connectors, in plain terms
Machines don't share one universal mount. There are a handful of systems, and the names get thrown around like everyone already knows them:
- Quick Connector (push-fit / quick-air). A spring-loaded coupler — push the attachment on, it clicks, pull a collar to release. Fast, tool-free. This is what FRAME 01 uses natively.
- 3XLR. A three-pin connector borrowed from pro audio cabling. Very common, sturdy, and easy to adapt to. Most machines that don't use it natively ship or sell a Quick-Connector→3XLR adapter.
- KlicLok. A proprietary quick-lock system (Hismith's). Locks attachments in firmly; only works with KlicLok attachments or via an adapter.
- Vac-U-Lock. The famous one — a Doc Johnson standard where the dildo has a hollow cavity that slides onto a matching plug. Huge library of compatible toys. We'll come back to it, because it's the one people get wrong.
The thing to internalize: these are not interchangeable. A "universal" adapter is only universal within the systems it actually names. Before you buy an attachment or an adapter, match it to your machine's exact mount — KlicLok, 3XLR, or Quick Connector — not just "it's a sex machine."
the honest truth about Vac-U-Lock
Vac-U-Lock is brilliant for what it was built for: hand-held and harness play, where a dildo slides onto a plug and a giant catalog suddenly fits. The cavity-and-plug design is a vacuum fit, though — and under sustained machine thrust, a vacuum fit works loose. It wobbles, it can spin, it can pull off mid-stroke.
So we won't sell you a "Vac-U-Lock compatible" promise on a thrusting machine and pretend it holds. It isn't a stable high-thrust mount, and dressing it up as one just means a frustrating session and a toy on the floor.
If you want to run your own toy, the honest path is different.
running your own dildos
The reliable way to put a toy you already love on a machine: a suction-cup adapter plus a suction-base dildo.
- The dildo's suction base presses onto the adapter, the adapter mounts to the machine shaft.
- It holds far better under thrust than a Vac-U-Lock plug because it's pressure-locked, not vacuum-slid.
- Match the suction-cup size to the adapter (common adapters fit bases under ~3.5"; larger ones go to ~4.5").
It's still worth testing at low speed first — any "bring your own" setup is an experiment, not a guarantee. But suction is the version that actually behaves.
material: what's touching you matters more than the connector
A connector decides if it fits. The material decides whether it's safe to use:
- TPE — soft, skin-friendly, affordable, and what most standard attachments are. It's porous, though: it can harbor bacteria over time. Use water-based lube only (silicone lube degrades it), wash before and after every use, and a condom makes cleanup and hygiene easy.
- Silicone (platinum/medical-grade) — non-porous, body-safe, and boilable, so it actually sanitizes. Costs more, lasts longer, worth it for anything going inside regularly.
Whatever you buy, look for ISO 3533 — the international safety standard for sex toys (materials and design). It's the clean shorthand for "this won't off-gas something it shouldn't." Both our TPE and silicone meet it.
how to choose, quickly
- Match the connector to your machine's mount first. Everything else is moot if it won't attach.
- Pick the material for how you'll use it — TPE for budget and external, silicone for internal and shared.
- Mind the size — a machine drives an attachment with force; size up slowly, not all at once.
- Clean it right — water-based lube, wash before/after, boil silicone, condom the TPE.
the short version
There's no single universal mount, Vac-U-Lock isn't a stable thrusting mount no matter who says it is, and the dependable "bring your own" route is a suction-cup adapter with a suction-base dildo. Match the connector, check for ISO 3533, and size up gently.
FRAME 01 keeps it simple: a push-fit Quick Connector with a 3XLR adapter in the box, so standard and 3XLR attachments work out of the gate — and a suction converter for running your own body-safe silicone. The rest of the line is on the collection page with the same plain-spoken specs.
