Fittings,
valves &
threads.
Not sure which thread you have? Put 'thread ID' in the message and attach a photograph of the outlet to the confirmation email — we will name the part.
North American IBC outlets are almost always 2-inch buttress; European bottles use S60x6 (DIN 61). Neither mates with NPT, BSP or garden-hose thread. Buttress measures ≈2.40 in across the male threads with a coarse squarish profile; S60x6 measures ≈2.36 in with a finer triangular profile. They will start on each other, bind, and crack the boss — so identify before you buy an adapter.
Thread identification, step by step
- Measure the outside diameter across the crest of the male threads with calipers or a ruler. 2.40 in / 61 mm → buttress. 2.36 in / 60 mm → S60x6.
- Look at the profile. Buttress threads are shallow with a squared flank — they look like a ratchet in cross-section. S60x6 is a conventional triangular thread form.
- Count the pitch. Buttress is about 4 threads per inch. S60x6 has a 6 mm pitch, so about 4.2 per inch. Close enough that profile is the better tell.
- Check the cap. If the 6-inch fill cap is marked DIN 61 or S70x6, the bottle is European and the outlet is very likely S60x6 too.
When in doubt, photograph it. A five-dollar part and a wasted week is a bad trade for thirty seconds of phone camera.
Thread reference table
| Thread | Specification & use |
|---|---|
| 2 in buttress | ≈2.40 in / 61 mm OD, coarse square profile, ≈4 TPI. Dominant on North American IBC outlets. Face-seals on a flat gasket — no tape. |
| S60x6 (DIN 61) | 60 mm OD, 6 mm pitch, triangular profile. Standard on European-made bottles. Also seen as 'coarse metric'. |
| S70x6 / 6 in buttress | The top fill cap. 6 in nominal; buttress and DIN variants are not interchangeable. |
| 2 in NPT | Tapered American pipe thread. Not an IBC thread — it is what you adapt TO so you can connect pipe and hardware. |
| 3/4 in GHT | Garden hose thread. Needs a buttress or S60x6 adapter. Our single most-ordered part. |
| 2 in camlock (Type C / F) | Quick-release coupling. Best choice if the tote is connected and disconnected often. |
| 2 in tri-clamp | Sanitary fitting, standard on stainless IBCs. Gasketed, clamped, fully cleanable. |
Fitting a valve without destroying the tote
- Confirm the tote is empty and vent the 6-inch cap first.
- Back the old valve off by hand. Never a pipe wrench on the boss.
- Inspect the boss sealing face for scoring or gouges. A scored face will always weep and cannot be fixed with more torque.
- Fit a clean, dry EPDM gasket. No tape, no dope — it is a face seal.
- Hand-tighten, then a quarter turn with a strap wrench. Then stop.
- Fill with twenty gallons of water and watch the joint for ten minutes.
Valve selection
Butterfly: cheap ($8 reclaimed, $22 new), light, quarter-turn, adequate for most duty. Standard fit on the great majority of totes.
Full-port ball: $34 new. Better flow on viscous product, much better seal life under frequent cycling, and far less likely to weep after a year of daily use.
Camlock: for anything connected and disconnected repeatedly. The $18 pair pays for itself in saved thread wear alone.
Everything above is stocked — see accessories and parts for current pricing.
Adapter paths
| From → To | Price |
|---|---|
| 2" buttress → 3/4" GHT | $9 |
| 2" buttress → 2" NPT male | $11 |
| 2" buttress → 2" camlock | $13 |
| S60x6 → 3/4" GHT | $10 |
| S60x6 → 2" NPT | $12 |
| S60x6 → 2" buttress | $16 |
| 6" cap → 2" NPT bung | $16 |
Three ways to kill a boss
- Pipe wrench. Cracks the moulded shoulder. Non-repairable.
- Cross-threading buttress into S60x6. Strips the plastic thread in one turn.
- Over-torquing to stop a leak. The leak is a gasket or a scored face. More torque makes it worse, then permanent.
Fitting questions
How do I tell buttress from S60x6?
Measure the outside diameter across the male threads. Buttress is about 2.40 inches (61 mm) with a coarse, squarish, shallow profile and roughly 4 threads per inch. S60x6 is about 2.36 inches (60 mm) with a visibly finer, more triangular profile and a 6 mm pitch — about 4.2 threads per inch. They will start on each other and then bind, which is exactly how people crack a boss. If you are unsure, photograph the outlet next to a ruler and send it.
Can I screw a garden hose onto an IBC?
Not directly. You need a 2-inch buttress to 3/4-inch GHT adapter (or the S60x6 version). It is a $9 part and it is the single most-ordered item on our accessories list, because almost nobody expects a bulk container to need an adapter for a hose.
Should I use thread tape on a buttress fitting?
No. A buttress connection is a face seal — it seals on a flat gasket at the base of the thread, not on the thread flanks. Tape or pipe dope on the threads does nothing useful and prevents the fitting from seating fully, which makes it leak. Fit a clean dry EPDM gasket and hand-tighten plus a quarter turn with a strap wrench.
What is the most common way people destroy a tote?
Over-torquing the discharge boss. The boss is moulded into the bottle wall and a pipe wrench on it will crack the shoulder, which is a non-repairable failure — that bottle is now a planter. Use a strap wrench, hand pressure plus a quarter turn, and stop. More totes die this way than from any other cause we see at intake.
Are butterfly or ball valves better?
Butterfly for cheapness, lightness and fast quarter-turn operation; it is what 90% of totes ship with and it is fine. Ball valves for full-port flow, better sealing on viscous product and much better longevity under frequent cycling. If you will open and close the valve daily for years, pay the extra $12 for a ball valve.
Every thread you will meet on a bulk container
| Thread | Nominal | OD | Profile | Pitch | Seals on | Found on |
|---|---|---|---|---|---|---|
| 2 in buttress | 2 in | ≈2.40 in / 61 mm | Coarse, shallow, square flank | ≈4 TPI | Flat face gasket | Most North American IBC outlets |
| S60x6 (DIN 61) | 2 in | 60 mm | Triangular | 6 mm | Flat face gasket | European-made bottles |
| S70x6 / DIN 71 | 6 in fill | 70 mm | Triangular | 6 mm | Lid gasket | European fill caps |
| 6 in buttress | 6 in fill | ≈6.3 in | Coarse square | — | Lid gasket | North American fill caps |
| 2 in NPT | 2 in | 2.375 in | Tapered, 60° | 11.5 TPI | Thread interference + sealant | Pipework — what you adapt TO |
| 1 in NPT | 1 in | 1.315 in | Tapered, 60° | 11.5 TPI | Thread + sealant | Smaller plumbing takeoffs |
| 3/4 in GHT | 3/4 in | 1.0625 in | Straight, rounded | 11.5 TPI | Hose washer | Garden hose — needs an adapter |
| 2 in camlock C / F | 2 in | — | Cam and groove, no thread | — | Gasket + cam lugs | Quick disconnect |
| 2 in tri-clamp | 2 in | 2.516 in ferrule | Sanitary clamp | — | Gasket + clamp | Stainless IBCs |
| BSP parallel / taper | Various | — | 55° Whitworth | Various | Washer or sealant | Imported equipment; not an IBC thread |
Identification sequence
- Measure the outside diameter across the crest of the male threads. 2.40 in / 61 mm is buttress; 2.36 in / 60 mm is S60x6. This alone resolves most cases.
- Look at the flank profile. Square and shallow — like a ratchet in cross-section — is buttress. Conventional triangular is S60x6. More reliable than pitch counting.
- Count pitch over an inch. Four is buttress; a shade over four is S60x6. They are close enough that this is the weakest of the three tests.
- Read the fill cap marking. DIN 61, DIN 71 or S70x6 on the 6-inch cap means a European bottle and very probably an S60x6 outlet.
- If still unsure, photograph it next to a ruler or a coin. We transcribe these daily and it takes thirty seconds.
Every conversion, priced, with what it is for
| From → to | Price | Use case |
|---|---|---|
| 2 in buttress → 3/4 in GHT | $9 | Garden hose, soaker hose, drip line. The most-ordered part we sell |
| 2 in buttress → 2 in NPT male | $11 | Rigid pipework, pumps, filters, meters |
| 2 in buttress → 1 in NPT | $10 | Smaller takeoffs, dosing lines |
| 2 in buttress → 2 in camlock | $13 | Frequent connect/disconnect — pays for itself in thread wear |
| 2 in buttress → 1.5 in NPT | $11 | Matching existing 1.5 in plumbing |
| S60x6 → 3/4 in GHT | $10 | Same as above, European bottle |
| S60x6 → 2 in NPT | $12 | Same as above, European bottle |
| S60x6 → 2 in buttress | $16 | Standardising a mixed fleet onto one accessory set |
| 6 in cap → 2 in NPT bung | $16 | Top-fill plumbing, vent lines, recirculation returns |
| 6 in cap → vented with screen | $18 | Off-gassing product, or outdoor storage; also keeps insects out |
| 2 in camlock pair, Type C and F | $18 | The male and female halves |
Standardising a mixed fleet
If you run twenty totes with a mix of buttress and S60x6 outlets, the cheapest route to one accessory set is a $16 S60x6-to-buttress adapter left permanently on the European units. You then buy one kind of hose fitting, one kind of camlock and one spare valve type instead of two of everything.
We will also do this before despatch at no labour charge on orders of ten or more — ask for a matched outlet fleet and we fit the adapters on the pad.
Butterfly, ball or camlock
| Type | New | Reclaimed | Flow | Seal life under cycling | Best for |
|---|---|---|---|---|---|
| 2 in butterfly, buttress | $22 | $8 | Good | Moderate | General duty. Standard fit on ~90% of totes |
| 2 in full-port ball, buttress | $34 | $12 | Excellent | Much better | Daily cycling, viscous product, long service |
| S60x6 butterfly | $26 | $9 | Good | Moderate | European bottles |
| 2 in camlock on an adapter | $18 + $13 | — | Good | Excellent — no thread wear | Frequent connect/disconnect |
| Dosing valve / tap | $16 | — | Low, controlled | Good | Measured dispensing, hand filling |
| Hose bib on an adapter | $9 + $14 | — | Low | Good | Garden and washdown use |
Where we will not sell reclaimed
Potable water, food product, or anything whose leak would be a reportable spill. The valve seat is a wear surface and a used wear surface is a gamble. In those cases we quote new and say why — the difference is $14 a unit and the downside is a spill.
Fitting procedure
- Confirm empty and vent the fill cap. Never work on a closed tote. A sealed vessel being drained pulls a vacuum and panels the bottle.
- Back the old valve off by hand. If it will not move by hand, use a strap wrench. Never a pipe wrench on the moulded boss — that cracks the shoulder, and that is unrepairable.
- Inspect the boss sealing face with a torch. Scoring or gouging means it will always weep and no torque fixes it. Stop here and tell your supplier; this is a rejectable defect.
- Fit a clean, dry EPDM gasket. No tape, no pipe dope. A buttress connection is a face seal on a flat gasket at the base of the thread, not a thread seal — tape prevents full seating and causes the leak it was meant to prevent.
- Hand-tighten, then a quarter turn with a strap wrench. Then stop. Over-torquing to chase a leak is how most destroyed bosses happen.
- Water test. Twenty gallons, valve closed, watch the joint for ten minutes before you trust it with product.
Detailed questions
Why does my adapter leak even though it is tight?
Three possibilities in order of likelihood: the gasket is missing, hardened or doubled up; you used thread tape, which prevents the face seal from seating; or the boss sealing face is scored, in which case no amount of torque will fix it. Check in that order and stop tightening.
Can I use PTFE tape on an IBC outlet?
On the NPT side of an adapter, yes — that is a thread seal and tape belongs there. On the buttress or S60x6 side, no. That is a face seal on a flat gasket and tape actively causes leaks by holding the fitting off the gasket.
What torque should I use?
Hand tight plus a quarter turn with a strap wrench. There is no published figure because the boss is moulded plastic with wide tolerance, and the honest answer is that the gasket does the sealing and additional torque only adds risk. If it leaks at that torque, the problem is the gasket or the face.
Do I need a vented cap?
Yes if the product off-gasses — hypochlorite, peroxide, anything fermenting — and yes if the tote is stored outdoors through temperature swings. Also yes if you will gravity-drain it, because a sealed vessel pulls a vacuum and panels the bottle inward. $14, and it is the cheapest insurance on this page after a gasket.
Can I fit a sight glass or level gauge to a used tote?
An external sight tube, yes — $88 fitted, plumbed off the discharge boss with an isolation point so you can shut it for cleaning. An in-wall sight glass means drilling and sealing a bulkhead, which is possible at $45 but puts a penetration in a pressurised wall and we generally recommend the external tube instead.
What is the strongest outlet configuration?
A 2-inch full-port ball valve with a camlock adapter left permanently fitted, so all the connect-disconnect wear happens on the camlock rather than the thread. $34 plus $13 plus an $18 camlock pair. On a tote cycled daily it will outlast three butterfly valves.
Are there adapters for metric plumbing?
Yes, buttress and S60x6 to BSP parallel and taper, though we stock them intermittently because demand is low in North America. If you have imported equipment, tell us the thread designation and we will source it rather than having you improvise with an NPT adapter and sealant.
How do I stop people over-torquing valves on my own fleet?
Remove the pipe wrenches from the area and leave a strap wrench. We are not joking — over-torquing the boss is the single most common way a serviceable tote becomes a planter, and the tool availability is the cause more often than the operator.
Photograph the outlet
Send it with your enquiry and we will name the exact part number instead of guessing.