DUC-LUG: a ductile iron lug with two holes

Pictures from the SIGMA spec sheets and studio photos. The item number sets the product, material and size.

Item # DLG Questions and answers (6)

DUC-LUG, Eye Bolts and Plugs

DUC-LUG and MJ eye bolts for tie rod restraint at mechanical joints, foam plugs for pipe, valve boxes and meter pits, and valve box alignment devices.

Priced by request

Add it to your quote list or call 800.999.2550.

DUC-LUG for 4 to 24 in. mechanical joints
DMPLUG pipe plugs, 4 to 24 in.
See all specifications

Product: DUC-LUG

Size: 3/4 in. (as listed)

Made: Ask your regional team

Finish: As listed

As SIGMA lists it.

Your distributor

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

Quote from SIGMA

Job location

Sends your quote list to the right regional team.

Quantity

Download the DUC-LUG spec sheet

Need help on the job?

Call 800.999.2550 with the pipe size and what you need to restrain or plug.

Find your regional team Documents

Everything about this item: 3/4 in. (as listed)

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

Product detailsWhat it is, highlights and documents

About DUC-LUG, eye bolts and plugs

DUC-LUG for tie rod restraint and MJ eye bolts to use in place of T-head bolts, both on 4 to 24 in. mechanical joints, per the spec sheets. Non-pressure DMPLUG pipe plugs, foam plugs for valve boxes and meter pits, and valve box alignment devices. Fit ranges and materials are under Specifications.

Highlights

DUC-LUG and MJ eye bolts, 4 to 24 in.
DMPLUG, valve box and meter pit plugs

Documents

SpecificationsDUC-LUG, 3/4 in. (as listed)

DUC-LUG, 3/4 in. (as listed)

Item number	DLG
Item	DUC-LUG
Size	3/4 in. (as listed)
Made	Ask your regional team
Material	As listed
Pressure rating	Not listed
Fits I.D. (spec sheet)
Weight	Ask your regional team
Pack quantity
In the Extended Range catalog	Page

DUC-LUG and eye bolts

DUC-LUG	Ductile iron, ASTM A536 Grade 65-45-12, for 4 to 24 in., installed between the MJ bell and the MJ gland, per the spec sheet
MJ eye bolts	High strength low alloy steel per ANSI/AWWA C111/A21.11, threads per ASME B1.1, used on 4 to 24 in., per the spec sheet. Stainless 304 as listed. The spec sheet's table lists IRB3445 and IRB584, and a note on the sheet says eye bolts are also offered in stainless steel. For IRB344 and IRB3445S dimensions, ask your regional team

Plugs

DMPLUG	Non-pressure, tapered closed cell foam plug for the bell or spigot end of pipe and fittings; one plug fits a range of inside diameters, per the spec sheet
Valve box plug	Closed cell foam, fits a standard valve box, with a handle for removal, per the spec sheet. The sheet lists it as a 6 x 4 in. plug
Meter pit insulation plugs	Laminated closed cell foam, 2.5 R-value per inch, 4 or 6 in. thick, tapered, with a handle, per the insulated foam plugs sheet. Have the pipe I.D. when you order

Valve box alignment devices

Use	A centering device used inside the valve box to keep the box from shifting during backfill and keep the operating nut reachable, per the Extended Range catalog
Caution	Not for use where a vertical load is placed on the device, which can bind the operating nut, per the catalog
Sizes	No. 1 to No. 4, as SIGMA numbers them. For the fit with your valve box, ask your regional team

From the Extended Products price catalog (rev. 7/29/26), the Extended Range catalog (May 2025), the DUC-LUG and MJ eye bolt spec sheets (April 2016), the DMPLUG and valve box plug spec sheets (June 2018) and the insulated foam plugs sheet (March 2020).

Every size and item numberItem numbers by size

The sizes that come with the choices picked above. Pick a size to load it.

DUC-LUG, eye bolts, plugs and valve box alignment devices: item numbers by size
Size	Item #	Weight (lb)
	DLG

Item numbers from the Extended Products price catalog (rev. 7/29/26), which is not posted online. These items are priced by request.

Questions and answers6 questions buyers ask about DUC-LUG and plugs

How are these items priced?

DUC-LUG, eye bolts, plugs and valve box alignment devices are priced by request. Add items to your quote list, ask your regional team, or call 800.999.2550 with the item numbers. SIGMA sells through waterworks distributors, and your distributor sets your price.

DUC-LUG or MJ eye bolt?

Per the spec sheets, a DUC-LUG installs between the MJ bell and the MJ gland and assists in restraining mechanical joints with threaded rods; an MJ eye bolt can be used in place of a T-head bolt. Use what the spec calls for.

What goes with a DUC-LUG?

The DUC-LUG spec sheet drawing shows DUC-LUGs on the T-bolt between the MJ bell and the gland (labeled restrainer gland), with a pigtail eye bolt and nut. The pigtail eye bolt is not on the price list: ask your regional team. Rod, couplings, nuts, washers and zinc caps are on the Rod Couplings, Rods and Sleeves page. For buried restraint, check the spec first.

Which DMPLUG size?

Each plug fits a range of inside diameters, per the spec sheet: DM-4 fits 3.75 to 6.0 in., for example. Pick a plug and its range shows under Specifications. For the DM-20 and DM-24 ranges, ask your regional team.

Is DMPLUG a pressure plug?

No. The spec sheet calls it a non-pressure plug, for keeping debris and sediment out of pipe and fittings.

Which meter pit plug?

Pick 4 or 6 in. thick, then the size. The meter pit plug spec sheet asks for the pipe I.D. to fit the plug, so have it ready when you ask your regional team.