Grooved Pipe Fittings

Grooved Rigid Couplings

A grooved rigid coupling is a two-piece fitting that holds two grooved pipe ends on the same axis. Once the housing locks into the grooves there is no angular or axial play between the pipes, so the line behaves like a welded joint.

Available from 1″ to 12″, rigid couplings are used on sprinkler risers, horizontal mains and straight runs with regular hanger spacing. Assembly takes two bolts, and the coupling can be removed and refitted when the line is modified.

1″ – 12″pipe size (product range)

GGG 40.3ductile iron housing

EPDMgasket, −34 °C … +150 °C

2 boltsfast assembly

Buy Now Request a Quote

Main Applications

Sprinkler risers and horizontal distribution lines
Straight sections of hose cabinet supply lines
Header joints in pump rooms
Cooling water and chiller lines
Ceiling runs that need hangers and supports

Technical Data

Connection	Grooved, rigid (movement locked)
Size	1″, 1¼”, 1½”, 2″, 2½”, 3″, 4″, 5″, 6″, 8″, 10″, 12″ (product range)
Housing	Ductile iron GGG 40.3 (manufacturer data)
Gasket	EPDM, −34 °C … +150 °C (manufacturer catalogue)
Optional gasket	Silicone or nitrile (by model)
Bolts and nuts	Galvanized carbon steel (manufacturer data)
Pipe	Roll or cut grooved steel pipe
Working pressure	By model and pipe wall thickness

Material Options

Part	Rigid coupling
Housing	Ductile iron GGG 40.3, two pieces
Gasket	EPDM (standard); silicone or nitrile (by model)
Bolts and nuts	Galvanized carbon steel
Finish	Painted (by model)

Which material? Use rigid couplings on straight lines with no thermal growth or vibration; flexible couplings are preferred at pump outlets and building expansion joints.

Advantages

Weld-Free Joint

Line built without welding
No hot-work permit

Fixed Line Geometry

Pipe ends stay on axis
Longer hanger spacing possible

Easy Removal

Opens by loosening two bolts

Wide Size Range

Same joining method from 1″ to 12″

Construction and Design Features

Two half housings with keys that seat in the groove
C-profile EPDM gasket
Oval-neck galvanized bolts and nuts
Housing profile that locks the pipe ends when closed

Send the pipe size and quantity; we will confirm the rigid coupling with stock availability.

How to Choose?

Set the sizeChoose the coupling for the nominal pipe size; confirm the pipe OD on 2½” lines.
Check the line typeUse rigid couplings on straight lines where no movement is expected.
Select the gasketAsk for EPDM on water lines and nitrile for oily media.
Inspect the grooveCheck groove depth and cleanliness before assembly.