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Flange Adapters.
For crews, distributors and engineers joining pipe to a flange.
✓ Adapters 2 to 36 in. ✓ DI, steel, PVC and HDPE pipe
✓ SFUP: UL listed, FM approved sizes
Which flange adapter does your joint need?
SFUP and SFA restrain plain-end pipe at a flange; ZIP FLANGE sets on with set screws. Threaded flanges are primarily used by flange fabricators. Anchor and filler flanges are commonly used by distributors and contractors for field applications and assembly.
Sizes depend on the pipe: check each card, or ask your regional team.
Looking for flanged fittings? See C110 flanged fittings under Ductile Iron Fittings.
SIGMAFlange Universal (SFUP)
A joint pack for plain-end pipe: adapter ring, ONE-LOK SLGU wedge-action gland, gasket and bolts. For 3 in. on steel, C909 PVC or HDPE, ask your regional team.
Ductile iron 3 to 36 in. · C900 PVC 4 to 36 in. · steel and IPS PVC 3 to 12 in.
SIGMAFlange Adapter (SFA)
A flange-by-MJ sleeve, restrained with a ONE-LOK SLDE gland on ductile iron pipe or SLCE on PVC pipe. Also sold packed with the gland; flange bolts not included.
Ductile iron 3 to 36 in. · PVC 4 to 36 in. · steel: ask your regional team
ZIP FLANGE
A set-screw flange that goes on plain-end ductile iron or steel pipe in the field. Not for plain-end fittings.
2 to 12 in.
Threaded flanges
Ductile iron high hub flanges for fabricating flanged ductile iron pipe: 125 lb drilled (DF), 125 lb tapped (TDF) and 250 lb drilled (HDF).
Price list: 3 to 64 in.
Anchor and filler flanges
Ductile iron anchor flanges (AF), and cast iron filler flanges (FF) in four thicknesses from 1-1/4 to 4-1/4 in.
Price list: anchor 3 to 60 in. · filler 3 to 24 in.
Catalogs, sheets and price lists.
One row per product. Every PDF is dated; where a price list runs past an older catalog, the table says so.
Import Restraint Products
Price list for SFUP, SFA and ZIP FLANGE. Effective 12/9/24, rev. 4/14/26
Import Fabricator Products
Price list for threaded, anchor and filler flanges. Effective 12/9/24
| Product | Documents | What it is | Pipe | Sizes |
|---|---|---|---|---|
|
SIGMAFlange Universal (SFUP) |
Catalog (PDF) May 2024 |
Flange adapter pack with wedge-action gland |
Ductile iron 3 to 36 in.; C900 PVC 4 to 36 in.; steel and IPS PVC 3 to 12 in.; C909 PVC and HDPE: ask your regional team |
3 to 36 in. |
|
SIGMAFlange Adapter (SFA) |
Catalog (PDF) Apr 2014 |
Flange-by-MJ sleeve, used with ONE-LOK SLDE or SLCE |
Ductile iron 3 to 36 in.; PVC 4 to 36 in. per the submittal, plus a 3 in. PVC pack (SFACP3) in the catalog and price list; steel: ask your regional team |
3 to 36 in. |
|
ZIP FLANGE |
Catalog (PDF) May 2024 |
Set-screw flange, installed in the field |
Ductile iron (ZF2-C, cast iron OD), steel (ZF2-S) |
2 to 12 in. |
|
Threaded flanges |
Fabricator catalog (PDF) Apr 2014 |
High hub flanges: DF 125 lb drilled, TDF 125 lb tapped, HDF 250 lb drilled |
Ductile iron, fabricated to AWWA C115 |
Price list: DF 3 to 64 in.; TDF 3 to 54 in.; HDF 3 to 48 in. |
|
Anchor and filler flanges |
Fabricator catalog (PDF) Apr 2014 |
Ductile iron anchor flanges (AF); cast iron filler flanges (FF) in four thicknesses |
Ductile iron |
Price list: AF 3 to 60 in.; FF 3 to 24 in. |
From the spec to the trench.
The engineer names the adapter and its rating in the spec. The distributor supplies it with the flanged fitting or valve it meets. The crew makes up the joint at the flange.
SFUP restraint gland with blue break-off bolts on a pipe end, from SIGMA's installation video.
2:1
Safety factor in the SFUP catalog and submittal specifications.
350 psi
SFUP rating on ductile iron pipe from 3 to 16 in., per its catalog. Ratings drop at larger sizes and vary by pipe.
UL · FM
SFUP is UL listed from 3 to 12 in. on ductile iron and steel pipe, and FM approved on C900 PVC pipe from 4 to 12 in. and on IPS PVC at 3 in.
Figures from the SFUP catalog (May 2024 edition) and submittal (September 2026). Ratings by pipe and size are in the PDFs.
Questions about flange adapters.
Short answers. The SFUP page has the detail.
It joins plain-end pipe to a flanged fitting, valve or pipe, with no threaded or welded flange on the pipe. The SFUP and the SFA, also called restrained flange adapters, restrain the pipe end with a ONE-LOK wedge-action gland.
Both join plain-end pipe to a flange. The SFUP is a joint pack: adapter ring, ONE-LOK SLGU wedge-action gland, mechanical joint gasket and hex bolts, for ductile iron, steel, PVC and HDPE pipe. The SIGMAFlange Adapter (SFA) is a flange-by-MJ sleeve that is restrained with a ONE-LOK SLDE gland on ductile iron pipe or SLCE on PVC pipe. It comes alone or packed with the gland (SFADP, SFACP). Flange bolts are not included with the SFA.
SFUP, per its rating table: ductile iron pipe, 3 to 36 in.; C900 PVC, 4 to 36 in.; steel and IPS PVC, 3 to 12 in. (confirm 3 in. on steel with your regional team); for C909 PVC and HDPE, ask your regional team. SFA: ductile iron pipe with a ONE-LOK SLDE gland, 3 to 36 in.; PVC pipe with SLCE, 4 to 36 in. per its submittal (its catalog and the price list also have a 3 in. PVC pack, SFACP3). The SFA submittal lists steel pipe with two different size ranges, and its catalog does not list steel: ask your regional team about steel and which gland to use. ZIP FLANGE: ductile iron pipe (ZF2-C, cast iron OD) or steel pipe (ZF2-S), 2 to 12 in.
A ductile iron flange with set screws that goes on plain-end ductile iron or steel pipe in the field, with standard flange bolts to the mating flange. It is rated 200 psi at 2 to 8 in. and 175 psi at 10 and 12 in. It is not designed for plain-end fittings. Check the pipe class or schedule against the set-screw torque table in its catalog: it has no values for ductile iron class 50 at 2 to 4 in. or steel schedule 20 and 30 at 2 to 6 in. For 14 in. and up, its catalog points to the SFUP.
SIGMA has ductile iron high hub threaded flanges for fabricating flanged ductile iron pipe to AWWA C115: DF 125 lb drilled, 3 to 64 in.; TDF 125 lb tapped, 3 to 54 in.; HDF 250 lb drilled, 3 to 48 in., per the Import Fabricator Products price list, which has the list prices. The April 2014 catalog has dimensions for DF 3 to 64 in., TDF 3 to 48 in. and HDF 3 to 24 in.
On SIGMA's price lists, on the Price Lists page. Product pages link to the list where one is posted. SIGMA sells through waterworks distributors, and your distributor sets your price. For contract pricing, ask your regional team.
Have the spec in hand?
Your regional team can match it to the right model and size.