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GRUVLOK Clamp Coupling: Clamp, 3 in x 3 in, Ductile Iron, NBR Seal - Grooved Pipe Couplings
GRUVLOKGrooved Pipe Couplings

GRUVLOK Clamp Coupling: Clamp, 3 in x 3 in, Ductile Iron, NBR Seal

The GRUVLOK Clamp Coupling is a grooved pipe coupling in a 3 in x 3 in size, constructed from ductile iron with an NBR seal. It is rated for a maximum operating pressure of 300 psi at 150° F (MPN 0390003689).

SKU 3G-OTH-468366

Brand
GRUVLOK
Item
Clamp Coupling: Clamp, 3 in x 3 in, Ductile Iron, NBR Seal
Category
Grooved Pipe Couplings
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Technical Specifications

GRUVLOK
Manufacturer Part Number
0390003689
Type
3 in x 3 in, Ductile Iron, NBR Seal, 300 psi @ 150° F
Fitting Pipe Size
3 in x 3 in
Maximum Operating Pressure
300 psi @ 150° F
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GRUVLOK Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The GRUVLOK Clamp Coupling is a grooved pipe coupling in a 3 in x 3 in size, constructed from ductile iron with an NBR seal. It is rated for a maximum operating pressure of 300 psi at 150° F (MPN 0390003689).

Frequently Asked Questions

What is a GRUVLOK clamp coupling used for?

A GRUVLOK clamp coupling joins grooved-end pipe in fire protection, HVAC, and industrial piping systems. It provides a rigid or flexible connection rated up to 300 psi at 150 °F, using a ductile-iron housing and NBR seal for reliable sealing in water and light oil services.

What are the specifications of the GRUVLOK 0390003689 coupling?

The GRUVLOK 0390003689 is a 3 in x 3 in grooved pipe coupling made of ductile iron with an NBR seal. It has a maximum operating pressure of 300 psi at 150 °F. The coupling is designed for use with standard-groove pipe in commercial and industrial applications.

Where to buy GRUVLOK couplings worldwide?

3G Electric supplies GRUVLOK clamp couplings worldwide. As a global industrial sourcing partner, we handle logistics, customs clearance, and delivery to your site. Contact us for a quote on the 0390003689 or other GRUVLOK grooved pipe couplings for your project.

How to install a GRUVLOK grooved pipe coupling?

To install a GRUVLOK coupling, ensure pipe ends are clean and grooved per manufacturer specifications. Lubricate the NBR gasket and place it over the pipe ends. Position the ductile-iron housing over the gasket, insert bolts, and tighten evenly to the recommended torque. Always follow GRUVLOK installation instructions.

Used in

Common applications for GRUVLOK
Fire-protection systems — GRUVLOK ductile iron butterfly valves (e.g., SKU 3DVX7) for water-based sprinkler and standpipe networks.
Chemical processing — GRUVLOK carbon steel butterfly valve with 316 stainless steel disc (SKU 60WR76) for handling corrosive media.
General water distribution — GRUVLOK ductile iron butterfly valve with EPDM seat (SKU 60WR98) for municipal or industrial water lines.
HVAC piping — GRUVLOK grooved-end butterfly valves for chilled water or hot water systems requiring quick installation.
Industrial process control — GRUVLOK lever-operated butterfly valve (SKU 60WR82) for throttling or isolation in chemical media applications.

GRUVLOK Products

3G Electric supplies GRUVLOK grooved pipe couplings. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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GRUVLOK Clamp Coupling: 3 in x 2 1/2 in, EPDM Seal, 500 psi, Ductile Iron, Bolted, 7 1/8 in Lg (MPN 0390111680). Key specifications — Maximum Operating Pressure: 500 psi; Brand: GRUVLOK.
GRUVLOK Clamp Coupling: 2 in x 2 in, NBR Seal, 750 psi, Ductile Iron, Grooved x Grooved x Grooved (MPN 0390101962). Key specifications — Maximum Operating Pressure: 750 psi; Brand: GRUVLOK.
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GRUVLOK Clamp Coupling: 8 in x 8 in, EPDM Seal, 300 psi, Ductile Iron, Grooved x Grooved x Grooved (MPN 0390211662). Key specifications — Maximum Operating Pressure: 300 psi; Brand: GRUVLOK.
GRUVLOK Metal Pipe Straight: Straight, 4 in x 4 in, Ductile Iron, EPDM Seal, 300 psi @ 150° F (MPN 0390007409). Key specifications — Brand: GRUVLOK; Maximum Operating Pressure: 300 psi @ 150° F; Fitting Pipe Size: 4 in x 4 in.
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