SIGMAFlange Universal SFUP joining PVC pipe to a flanged fitting, catalog render

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Item # SFUP8 Questions and answers (8)

SIGMAFlange Universal Flange Adapter

Model SFUP joins plain-end pipe to a flange: ductile iron 3 to 36 in., C900 PVC 4 to 36 in., steel and IPS PVC 3 to 12 in. The pack has the adapter ring, a ONE-LOK SLGU wedge-action gland, the MJ gasket and the hex bolts. Steel and IPS PVC also need a transition gasket: ask your regional team.

View price list (PDF)

Rated 350 psi on ductile iron pipe at 8 in.
Rated to the working pressure of the pipe, up to the catalog table, with a 2:1 safety factor. On C900 PVC: DR18 235 psi (4 to 36 in.), DR14 305 psi (4 to 16 in.); FM ratings are lower
UL listed 3 to 12 in. on ductile iron and steel pipe; FM approved on C900 PVC, 4 to 12 in., and IPS PVC at 3 in.
See all specifications

Size: 8 in.

Made: Import

Listed on the Import Restraint Products price list. Domestic-content requirement on the job? Ask your regional team.

Coating: Standard

E-coat undercoat with black alkyd enamel on the adapter ring and gland; blue alkyd enamel on the wedges and break-off bolts.

Your distributor

SIGMA sells through waterworks distributors. Order with item # SFUP8.

Quote from SIGMA

Job location

Sends your quote list to the right regional team.

Quantity

Download the SFUP submittal

Need help on the job?

Call 800.999.2550 with the pipe type and the size.

SFUP or SFA? All flange adapters Installation video (57 seconds)

Everything about the 8 in. SFUP flange adapter.

Details, specs, every size and the questions buyers ask. Open what you need.

Product detailsWhat it is, highlights and documents

About the SFUP

The SIGMAFlange Universal, model SFUP, connects plain-end pipe to a flanged fitting, valve or pipe. A ductile iron adapter ring with an O-ring seals against the flange, and a ONE-LOK SLGU wedge-action gland restrains the pipe end.

The catalog lists it for ductile iron, steel, C900 and C909 PVC, IPS PVC and HDPE pipe. Sizes and ratings differ by pipe, and C909 PVC and HDPE are not in its rating table: see Specifications.

It accommodates pipe misalignment, needs no special tools, and comes apart for service.

Highlights

3 to 36 in. on ductile iron pipe; sizes for other pipe are under Specifications
Adapter ring and gland in ductile iron, ASTM A536 Grade 65-45-12
Max. deflection 5° at 3 to 12 in., down to 1° at 36 in.

Documents

Specifications8 in. SFUP flange adapter · 350 psi on ductile iron pipe

8 in. SFUP flange adapter

Item number	SFUP8
Model	SFUP: plain-end pipe to a flange
Size	8 in.
Made	Import
Coating	Standard
Rating on ductile iron pipe	350 psi
Max. deflection	5°
Weight	37 lb
Crate quantity
Catalog page	Page of the SFUP catalog
Price list	Import Restraint Products, effective 12/9/24, rev. 4/14/26

Materials

Adapter ring and gland	Ductile iron, ASTM A536 Grade 65-45-12
Gaskets	Mechanical joint gasket and O-ring in SBR per ANSI/AWWA C111/A21.11. EPDM, neoprene and nitrile are options on the submittal: ask your regional team
Hex bolts and nuts	Carbon steel per ASTM A307, zinc plated per ANSI/AWWA C111/A21.11. Type 304 or 316 stainless steel and blue fluoropolymer are options on the submittal: ask your regional team
Coating	Adapter ring: NSF 61 approved e-coat undercoat with black alkyd enamel. Gland: e-coat undercoat with black alkyd enamel. Wedges and break-off bolts: blue alkyd enamel
In the pack	Adapter ring (SAR), SLGU restraint gland, mechanical joint gasket (MGS) and hex bolts

Ratings and approvals

Pressure rating	Equal to the working pressure of the pipe it is installed on, up to the values below, with a 2:1 safety factor
Ductile iron pipe	350 psi at 3 to 16 in.; 300 psi at 18 in.; 250 psi at 20 in.; 200 psi at 24 and 30 in.; 175 psi at 36 in.
Steel pipe	350 psi at 3 to 12 in. For 3 in. on steel, confirm with your regional team: the catalog's installation steps describe the 3 in. size for ductile iron and IPS PVC pipe
C900 PVC (CI OD)	DR14: 305 psi at 4 to 16 in. DR18: 235 psi at 4 to 36 in. DR25: 165 psi at 4 to 36 in. DR32.5: 125 psi at 14 to 36 in.
IPS PVC	SDR17: 250 psi. SDR21: 200 psi. SDR26: 160 psi. All at 3 to 12 in.
C909 PVC and HDPE	In the catalog's pipe list, not in its rating table: ask your regional team
UL and FM	UL listed at 3 to 12 in. on ductile iron and steel pipe, 350 psi. FM approved at 3 in. on IPS PVC pipe and at 4 to 12 in. on C900 PVC pipe: DR18 200 psi; DR14 250 psi at 4 and 6 in., 200 psi at 8 to 12 in. Where FM approval is required, use the FM ratings
Dimensions and traceability	Conform to ANSI/AWWA C110/A21.10. Gland body, wedge inserts and break-off bolts are cast with heat code information

Installation

Before you start	Ductile iron or C900 PVC pipe: install as received. IPS PVC or steel pipe: remove the white plastic spacers from the break-off bolts. The 3 in. size has no spacers. C909 PVC or HDPE: ask your regional team about the spacers
Assembly	Clean the pipe end and the flange face. Slide on the gland, lip toward the plain end. Lubricate the pipe end and the gasket, then slide on the gasket (a transition gasket on steel and IPS PVC), then the adapter ring, O-ring toward the plain end. Join within the deflection and gap C
Hex bolts	Hand-tighten, then torque in a star pattern: 45 to 60 ft-lbs at 3 in.; 75 to 90 at 4 and 6 in.; 90 to 110 at 8 to 24 in.; 120 at 30 and 36 in.
Break-off bolts	After any deflection adjustment, hand-tighten in a star pattern until every wedge touches the pipe, then tighten until the heads shear off: 55 to 65 ft-lbs at 3 in.; 70 to 80 at 4 to 24 in.; 100 at 30 and 36 in.
HDPE pipe	The catalog recommends a pipe stiffener or insert directly under the wedge gland

From the SFUP catalog (May 2024 edition) and submittal (September 2026). Weights are from the dimensional chart. Dimensions and drawings are in the catalog, under Documents.

Every size and item number13 sizes of the SFUP flange adapter · Import, Standard · item numbers

Showing the SFUP flange adapter, Import, Standard. Item numbers follow the options above. Pick a size to load it.

SFUP: item numbers, ratings on ductile iron pipe and weights by size
Item #	DI pipe rating	Weight
SFUP3	350 psi	13 lb
SFUP4	350 psi	19 lb
SFUP6	350 psi	28 lb
SFUP8	350 psi	37 lb
SFUP10	350 psi	58 lb
SFUP12	350 psi	66 lb
SFUP14	350 psi	80 lb
SFUP16	350 psi	109 lb
SFUP18	300 psi	124 lb
SFUP20	250 psi	160 lb
SFUP24	200 psi	209 lb
SFUP30	200 psi	402 lb
SFUP36	175 psi	583 lb

Weights from the SFUP dimensional chart (catalog and submittal). Ratings are on ductile iron pipe; other pipe is under Specifications.

Questions and answers8 questions buyers ask about the SFUP

Where do I find the price?

On SIGMA's price lists. Where an item is on a posted list, the View price list button near the top of this page opens it, and every posted list is on the Price Lists page. SIGMA sells through waterworks distributors, and your distributor sets your price. For contract pricing, ask your regional team.

What comes in an SFUP pack?

One adapter ring with its O-ring (SAR), one ONE-LOK SLGU wedge-action restraint gland, one mechanical joint gasket (MGS) and the hex bolts: 4 at 3 in., 8 at 4 to 8 in., 12 at 10 to 14 in., 16 at 16 and 18 in., 20 at 20 and 24 in., 28 at 30 in. and 32 at 36 in. For steel and IPS PVC pipe the catalog calls for a transition gasket, which its pack table does not list: ask your regional team whether it comes in the pack.

Which pipe does it fit?

The catalog lists plain-end ductile iron, steel, AWWA C900 and C909 PVC, ASTM D2241 (IPS) PVC and HDPE pressure pipe. Sizes by pipe, from its rating table: ductile iron 3 to 36 in.; C900 PVC 4 to 36 in.; steel and IPS PVC 3 to 12 in. On ductile iron or C900 PVC pipe, install it as received. On IPS PVC or steel pipe, remove the white plastic spacers from the break-off bolts before assembly, and use a transition gasket. The catalog's installation steps describe the 3 in. size, which has no spacers, for ductile iron and IPS PVC pipe; for 3 in. on steel, confirm with your regional team. On C909 PVC or HDPE, ask your regional team about the spacers before assembly. On HDPE, the catalog recommends a pipe stiffener under the gland.

What pressure is it rated for?

The working pressure of the pipe it is installed on, with a 2:1 safety factor, within the catalog table. On ductile iron pipe that is 350 psi from 3 to 16 in., stepping down to 175 psi at 36 in. On C900 DR18 PVC it is 235 psi from 4 to 36 in. FM-approved ratings on C900 PVC are lower (200 or 250 psi): use them where FM approval is required. Every pipe class and size is under Specifications. The catalog table does not list C909 PVC or HDPE: ask your regional team.

How much deflection does it take?

5° at 3 to 12 in., 3° at 14 and 16 in., 2° at 18 and 20 in., 1.5° at 24 and 30 in., and 1° at 36 in. Make any deflection adjustment before you tighten the break-off bolts, and keep the gap to the flange face within dimension C in the catalog.

Is it UL listed or FM approved?

UL listed from 3 to 12 in. on ductile iron and steel pipe, at 350 psi. FM approved at 3 in. on IPS PVC pipe and from 4 to 12 in. on C900 PVC pipe: DR18 at 200 psi, and DR14 at 250 psi (4 and 6 in.) or 200 psi (8 to 12 in.).

SFUP or SFA: which one?

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.

Can it be taken apart?

Yes. Loosen the wedge bolts by the hex shank that stays after the heads break off. To put it back, repeat the installation steps and torque the hex shanks to the specified value: ask your regional team for it.