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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).
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.
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.
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.
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 |
6 x 24 to 6 x 54 in., plus a 6 x 16 long radius (DBLM616, not on the spec sheet) |
Spec sheet (PDF) Oct 2026 |
|
DBP |
6 x 24 to 6 x 54 in., plus a 6 x 16 long radius (DBLP616, not on the spec sheet) |
Spec sheet (PDF) Oct 2026 |
|
XBM |
6 x 36, 6 x 42, 6 x 48 in. |
Spec sheet (PDF) Oct 2026 |
|
DBF |
6 x 30 to 6 x 48 in. |
Ask your regional team |
|
CHX |
4 to 36 in. tall |
Spec sheet (PDF) Oct 2026 |
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.
Match the end of the line from the main: mechanical joint (DBM), push-on (DBP) or flanged (DBF). The XBM is a mechanical joint bury designed to ANSI/AWWA C110; SIGMA sells it for Hawaii.
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 Western regional team can help match the bury and extension to the plans.