Reference

Which thread do you actually have?

Thread mismatch is a common cause of returned parts orders, and it is avoidable with a tape measure and a couple of minutes. This page is a reference sheet for identifying what is on your tote and what mates to it.

The short answer

Measure the outside diameter across the thread crests. ~60 mm = S60x6 (most common). ~70 mm = S70x6. ~100 mm = S100x8. Tapered with about 11.5 threads per inch = NPT. Include a photo with a tape across the thread in your request to help the partner supplier confirm it.

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Thread standards

The five you will encounter.

S60x6 and 2" NPT measure deceptively close on the outside. The thread count and taper, not the diameter, is what tells you.
Standard	Outside diameter	Pitch	Profile	Where you will find it	Seals against
S60x6	~60 mm	6 mm (about 4 per inch)	Coarse, straight	Most 275 gal composite IBCs	Flat gasket
S70x6	~70 mm	6 mm (about 4 per inch)	Coarse, straight	Some 330 gal units and some European bottles	Flat gasket
S100x8	~100 mm	8 mm (about 3 per inch)	Coarse, straight	Large-outlet and 3" discharge configurations	Flat gasket
2" NPT	~60 mm (2.375")	11.5 TPI	Tapered, 60° V	Adapters, pumps, plumbed installations	Thread interference + sealant
Camlock (Type A–F)	Varies by size	—	Cam and groove, no thread	Hose connections downstream of the valve	Gasket + cam lever

S60x6 and 2" NPT measure deceptively close on the outside. The thread count and taper, not the diameter, is what tells you.

Valve types

What to put on the outlet.

Valve	Flow	Best for	Watch out for
2" butterfly	Restricted at the disc	Gravity discharge, thin liquids, general use	Seat takes a set; replace the elastomer, not the valve
2" ball, full port	Unrestricted	Pumped transfer, viscous product, low-pressure sealing	Heavier and more expensive than a butterfly
3" butterfly	High	Fast drain, slurries, water transfer	Needs an S100x8 boss or an adapter
Camlock adapter	Matches hose	Quick hose changes in the field	Poly camlocks can crack in cold; aluminium suits outdoor winter work
Dispensing gun	Metered	Decanting into smaller containers	Needs a clean feed; fouled product jams the trigger

Installing a valve on a poly boss

The outlet boss on a composite IBC is polyethylene, and it is far less forgiving than it looks. Four rules keep it alive.

Firm hand tightness, no wrench. No strap wrench, no pipe on the handle. A flat gasket seals with modest compression and nothing is gained past that. Follow the valve maker's instructions where given.
New gasket every time. Reusing a compressed gasket is how a slow weep becomes a puddle.
No thread tape on a gasket-sealed thread. It does not seal on the thread; it seals on the face. Tape just makes assembly misleading.
Support the valve body. A heavy ball valve with a camlock and a hose hanging off it puts a cantilever load on a poly boss. Strap it or brace it.

Vented versus solid caps

The 6-inch fill cap comes in two forms, and the wrong one can collapse a bottle. When you gravity drain a sealed tote, the liquid leaving creates a vacuum. A vented cap admits air and the bottle keeps its shape. A solid cap does not, and the bottle can pull inward.

Use a solid cap for transport and storage, where you want no exchange with the atmosphere. Swap to a vented cap before you open the valve. If your operation cannot reliably do that swap, fit the vented cap permanently and accept the small amount of breathing.

Adapters worth keeping in the drawer

S60x6 male to 2" NPT female — the common bridge to plumbing
S60x6 to S70x6 — for mixed totes
2" NPT to camlock Type A and Type F
2" to 3/4" garden hose — for wash stations and irrigation
Dust caps for every outlet you own, because an open outlet collects grit

Fitting questions

How do I measure my IBC tote thread?

Measure the outside diameter of the male thread at the tote outlet with a tape or calipers, across the crests, not the valleys. About 60 mm is S60x6, the most common. About 70 mm is S70x6. Then count the thread peaks over an inch: coarse IBC threads have about four, while NPT pipe thread has eleven and a half and is tapered. If you include a photograph with a tape measure laid across the thread in your quote request, the partner supplier can help identify it.

What is the difference between S60x6 and a 2-inch NPT?

Almost everything except the outside diameter. S60x6 is a coarse, straight thread used on bulk containers: 60 mm nominal, 6 mm pitch, designed to seal against a flat gasket. NPT is a tapered pipe thread that seals on thread interference with sealant. They are not interchangeable, and forcing one into the other can crack the poly boss. Adapters exist precisely because people keep trying.

Butterfly or ball valve?

Butterfly valves are cheaper, lighter, quarter-turn, and adequate for gravity discharge of thin liquids — which is much tote use. Full-port ball valves give unrestricted flow, tend to seal well at low pressure, handle viscous product better, and cost more. If you are pumping rather than gravity draining, or your product is thick, consider the ball valve.

Why does my valve weep even when closed?

Usually a worn seat, not a failed valve. Butterfly seats are elastomer and take a set over time, particularly after exposure to solvent, heat or UV. A replacement seat is inexpensive and quick to fit. Another common cause is over-tightening the valve into the poly boss with a wrench, which can distort the sealing face permanently.

Flow

What affects how fast a tote empties.

Gravity drain rate depends on the outlet size, the valve type, the head of liquid above the outlet and the product's viscosity. Flow slows as the tote empties, and a vacuum will stop it entirely.

A sealed tote draining under gravity pulls a vacuum and the flow collapses. That is a cap problem, not a valve problem.
Setup	Relative flow	Notes	Right for
2" butterfly, gravity	Baseline	The disc sits in the flow path	Thin liquids, general use
2" ball full port, gravity	Faster than a 2" butterfly	Nothing in the flow path	Viscous product, pumped transfer
3" butterfly, gravity	Fastest gravity option	Needs the larger outlet	Slurries, fast drain, water
Any valve, solid cap fitted	Slows sharply, then stalls	Vacuum builds in the bottle	Nothing. Fit a vented cap.
2" with 3/4" hose adapter	Much slower	The hose is the restriction	Irrigation, wash stations
2" with a pump	Set by the pump	Independent of head	Transfer, elevation, pressure
Tilting stand	Similar	Leaves far less heel in the sump	Expensive product; recovers the heel

A sealed tote draining under gravity pulls a vacuum and the flow collapses. That is a cap problem, not a valve problem.

Reference

Common threads and fittings, with their mates.

The S60x6 versus 2" NPT confusion is the one that cracks bosses. They measure within a couple of millimetres and are completely different threads: count the peaks over an inch — about four is S60x6, eleven and a half is NPT.
You have	Measures	Identify by	Mates directly to	Bridge with
S60x6 male (tote outlet)	~60 mm OD	About 4 threads/inch, straight, flat face	S60x6 female valves and caps	S60x6 → 2" NPT adapter
S70x6 male	~70 mm OD	About 4 threads/inch, straight	S70x6 female valves	S70x6 → S60x6 reducer
S100x8 male	~100 mm OD	About 3 threads/inch, straight	3" butterfly assemblies	S100x8 → 3" NPT
2" NPT female (on a valve)	2.375" pipe OD	11.5 threads/inch, tapered	2" NPT male pipe and adapters	Direct with sealant
Camlock Type A (male adapter)	By size	Grooved, no thread	Type C, D coupler	—
Camlock Type F (male, NPT male)	By size	Grooved plus pipe thread	Type C, D coupler	—
Tri-clamp ferrule (stainless)	By size	Flanged, gasket between	Matching ferrule and clamp	Tri-clamp → NPT adapter
6" screw cap opening	~150 mm	Coarse, on the bottle top	6" vented or solid cap	Cap adapters for mixers

The S60x6 versus 2" NPT confusion is the one that cracks bosses. They measure within a couple of millimetres and are completely different threads: count the peaks over an inch — about four is S60x6, eleven and a half is NPT.

Tightening, once more

The coarse thread on an IBC outlet does not seal on the thread. The thread is a clamp; the seal is a flat gasket compressed between the face of the fitting and the face of the boss.

Firm hand tightness, no wrench. Thread tape does nothing except make the assembly feel tight before the faces have met, which is actively misleading. And once the boss face is distorted by over-tightening, no gasket will seal it — the boss is moulded into the bottle and cannot be machined back.

Diagnosis

Your valve is leaking. Which one is it?

Several different leaks look almost identical from across a room and have completely different fixes. Find the water first.

The third row is the expensive one. Once the moulded boss face is out of true nothing seals against it, and the boss is part of the bottle rather than a replaceable fitting.
Where the drip forms	Cause	Fix	Prevent by
From the valve spout when closed	Worn or compression-set seat	Replace the seat	Replacing seats when the tote is cleaned
From the joint between valve and bottle	Compressed flange gasket	New flange gasket, firm hand tightness	New gasket every removal
From the joint, and a new gasket did not fix it	Boss sealing face distorted by over-tightening	Cannot be repaired — rebottle	Never using a wrench
Around the valve body itself	Cracked body, usually cold or impact	Replace the valve	Bracing heavy assemblies
From the cap, on every move	UV-hardened cap gasket	New cap gasket	Regular replacement outdoors
From an adapter downstream	Wrong thread forced, or missing seal	Correct adapter and a new seal	Measuring the thread first
Nothing visible, but the tote is losing volume	Crazing or a wall split behind the cage	Inspect with a torch; retire the bottle if crazed	Keeping units out of UV

The third row is the expensive one. Once the moulded boss face is out of true nothing seals against it, and the boss is part of the bottle rather than a replaceable fitting.

Selection

Choosing a valve from the product, not the price.

The brine row is a common mistake. Undissolved salt can abrade a butterfly seat into a persistent leak; a full-port ball valve tolerates it better.
Your product	Valve	Seat	Why
Water, aqueous, fertiliser	2 in butterfly	EPDM	Adequate and least expensive
Glycol, coolant	2 in butterfly	EPDM	Straightforward
Caustic, dilute acid	2 in butterfly	EPDM	EPDM generally handles caustic better than FKM
Concentrated acid	2 in ball, full port	FKM	Better sealing; check compatibility
Edible or mineral oil	2 in butterfly	FKM	EPDM swells in oils
Fuels and solvents	2 in ball, full port	FKM	Sealing and compatibility; check current regulations
Latex, viscous coatings	2 in ball, full port	EPDM	A butterfly disc restricts flow
Syrups and honey	2 in ball, full port	EPDM	Flow, plus a heater at the outlet
Spent grain, slurries	3 in butterfly	EPDM	Solids may not pass a 2 in disc reliably
Food ingredients	2 in butterfly	EPDM or silicone	Fresh gaskets; ask for food-contact documentation
Brine with undissolved solids	2 in ball, full port	EPDM	A ball valve tolerates grit better
High-proof spirit	Tri-clamp	PTFE	Usually a stainless vessel; different fitting entirely

The brine row is a common mistake. Undissolved salt can abrade a butterfly seat into a persistent leak; a full-port ball valve tolerates it better.

Keep reading

Parts & accessoriesRequest valves, gaskets and adapters Anatomy teardownWhere the boss, the vent and the sump sit GlossaryBoss, sump, crazing and the rest Quote checklistWhat to include in a parts request