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Hydrant Buries and Extensions.

For distributors, contractors and utilities setting wet-barrel fire hydrants.

✓ MJ, push-on and flanged buries         ✓ Price lists online

Bury or extension?

The bury turns the line from the main up toward the hydrant. The extension brings it up to grade.

Also called a hydrant shoe (the bury) and a hydrant riser or spool (the extension).

Mechanical joint hydrant bury, drawing from the SIGMA DBM spec sheet

Hydrant buries

6 in. ductile iron buries: mechanical joint, push-on or flanged, 6 x 16 to 6 x 54 in., with an asphaltic or fusion bonded epoxy coat.

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Flanged cast iron hydrant extension, drawing from the SIGMA CHX spec sheet

Hydrant extensions

6 in. cast iron extensions, flange by flange, 4 to 36 in. tall, solid or break-off, cement lined or fusion bonded epoxy.

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Below the hydrant.

The bury turns the line up, the extension brings it to grade, and a wet-barrel hydrant sits on top. Each is bought separately.

Diagram: the hydrant bury turns the line from the main up, the hydrant extension brings it to grade, and the hydrant sits on top

3 connections

Mechanical joint, push-on and flanged buries.

16 heights

Extensions come 4 to 32 in. in 2 in. steps, plus 36 in.

282 item numbers

Every bury and extension on the two hydrant price lists. All but the San Diego drilled buries have a list price.

Figures from the hydrant price lists (effective 3/24/25) and the spec sheets (October 2026).

Spec sheets and price lists.

Both hydrant price lists and the four spec sheets. Sizes follow the item numbers on the price lists.

Cement lined price list

Buries and extensions, cement lined. Effective 3/24/25

Fusion epoxy price list

Buries with a fusion bonded epoxy coat; extensions lined and coated in fusion epoxy. Effective 3/24/25

Family Sizes Spec sheet

DBM
Mechanical joint bury, C153. 350 psi on the spec sheet

6 x 24 to 6 x 54 in., plus a 6 x 16 long radius (DBLM616, not on the spec sheet)

DBP
Push-on bury, C153. 350 psi on the spec sheet

6 x 24 to 6 x 54 in., plus a 6 x 16 long radius (DBLP616, not on the spec sheet)

XBM
Mechanical joint bury, C110. 350 psi on the spec sheet

6 x 36, 6 x 42, 6 x 48 in.

DBF
Flanged bury. No spec sheet

6 x 30 to 6 x 48 in.

Ask your regional team

CHX
Extension, cast iron, flange by flange. 250 psi (plain spool on the spec sheet)

4 to 36 in. tall

Questions about buries and extensions.

Short answers. The bury and extension pages have the detail.

The bury is the 90 degree bend, also called a hydrant shoe, that turns the line from the main up toward a wet-barrel fire hydrant. The extension, also called a hydrant riser or spool, is the flanged spool that brings it up to grade. The hydrant sits on top; SIGMA sells the parts below it.

Have the spec in hand?

Your Western regional team can help match the bury and extension to the plans.