SIGMA tapered round HDPE meter pit with a white interior

Photos of each pit style and the round extension. Drawings are further down this page and on the spec sheets. The item number sets the style, series and depth.

Item # RMP1824 Questions and answers (7)

Meter Pits

Round HDPE meter pits in four styles, 18 to 51 in. deep, and round extensions to add depth. Pick the style, the series and the depth.

By quote

Call 800.999.2550 with the part number, or ask your regional team.

Full barrel, straight wall, tapered and reverse tapered
Laminated HDPE walls; take standard covers and AMR lids
See all specifications

Style: Tapered

Series or size: RMP18

Depth or height: 24 in.

Made: Ask your regional team

The pit spec sheets do not say where the pits are made.

Material: HDPE

Pits: high density polyethylene regrind and virgin resins, per the pit spec sheets. The extensions spec sheet calls the extensions HDPE.

Your distributor

SIGMA sells through waterworks distributors. Order with item # RMP1824.

Quote from SIGMA

Job location

Sends your quote list to the right regional team.

Quantity

Download the spec sheets (all series)

Need help on the job?

Call 800.999.2550 with the style, series and depth you need.

All meter boxes and enclosures Spec sheets by series

Everything about this 24 in. item.

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

Product detailsWhat it is, highlights and documents

About meter pits

SIGMA's round meter pits come in four styles: full barrel, straight wall, tapered and reverse tapered. The spec sheets list each series by depth, from 18 to 51 in.

Per the spec sheets, the walls are laminated HDPE and, when buried, will support an incidental traffic load with an appropriate traffic-rated lid. Each pit takes all standard covers, AMR lids too, and round extensions add depth.

Highlights

Laminated HDPE walls, black outside
Takes standard covers and AMR lids

Documents

SpecificationsTapered, 24 in.

Tapered, 24 in.

Item number	RMP1824
Style	Tapered, RMP18
Depth or height	24 in.
Made	Ask your regional team
Material	HDPE
Load rating	Pits: available on request. Ask your regional team
Max. deflection
Weight	Ask your regional team
Pallet quantity
Spec sheet	RMP18
Price list

Pit materials and build

Material	High density polyethylene regrind and virgin resins, per the pit spec sheets
Walls	Laminated: the outer wall is laminated to the interior wall for more side load-bearing capacity
Colors	Black exterior; black or optional bright white interior
Flanges	Thermo flange 3 in. from the top; base flange at the top of the mousehole to reinforce the round base
Base	Per the pit spec sheets, an integral flat settling plate around the base
Extensions	Round HDPE extensions 16 to 36 in. across and 1 to 12 in. tall, black outside with a white or black inside (extensions spec sheet; no load rating stated). Pit extensions can be cut to grade or angle in the field

Pit rating and use

Wall	Per the spec sheets, when buried, will support an incidental traffic load with an appropriate traffic-rated lid
Load rating	Available on request: ask your regional team
Lids	Takes all standard covers, AMR lids too
Impact test	Per the spec sheets: at the top of the pit at the lid area and at the center; a crack, split or shatter of the wall is a failure

Dimensions

Depth	The spec sheets list each part number with its D dimension (Depths Available on the straight wall sheets), shown here as the depth. Extension heights are from the extensions spec sheet
Other dimensions	Ask your regional team

From the round meter pit spec sheets (October 2026; RMP1822-FB November 2026) and the extensions spec sheet (October 2026).

Every depth and part number6 depths

The depths that come with the style and series picked above. Pick a depth to load it.

Meter pits: part numbers by depth
Depth or height	Part #
	RMP1818
	RMP1824
	RMP1830
	RMP1836
	RMP1842
	RMP1848

Part numbers and depths from the round meter pit spec sheets; extension heights and weights from the extensions spec sheet. Meter pits are priced by request.

Questions and answers7 questions buyers ask about meter pits

How are these items priced?

Meter pits are priced by request. Ask your regional team, or call 800.999.2550 with the part number. SIGMA sells through waterworks distributors.

Full barrel, straight wall, tapered or reverse tapered?

Those are the four pit styles on the spec sheets. Each spec sheet lists its part numbers by depth (the D dimension, or Depths Available on the straight wall sheets). The straight wall spec sheets name the size, 15, 18, 20 or 36 in.; the tapered and reverse tapered spec sheets give the series name, and their text gives no diameter in inches. Straight wall part numbers end in -SW; a tapered pit with the same digits has no suffix.

What load can a pit take?

The spec sheets say that, when buried, the wall will support an incidental traffic load with an appropriate traffic-rated lid, and that the load rating is available on request. Ask your regional team for the rating on your pit and lid.

What lid goes on a pit?

Per the spec sheets, each pit takes all standard covers, AMR lids too. For metal meter lids, see the castings meter boxes and lids, or ask your regional team.

How is the wall built?

HDPE regrind and virgin resins in laminated walls: the outer wall is laminated to the interior wall for more side load-bearing capacity. A thermo flange sits 3 in. from the top, a base flange reinforces the round base above the mousehole, and an integral flat settling plate runs around the base.

Can I add depth?

SIGMA's extensions spec sheet lists round extensions 16 to 36 in. across (its A dimension) and 1 to 12 in. tall (pick Extension above), and 18 and 20 in. grade extensions angled 7 to 22 degrees. Ask your regional team which extension fits your pit; none is listed for the RMP15 series. The pit spec sheets say extensions can be cut to grade or angle in the field.