Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

Image not available
GRUVLOKGrooved Pipe Couplings

GRUVLOK Rigid Coupling 3 in x 3 in Ductile Iron NBR Seal 750 psi

The GRUVLOK Rigid Coupling is a rigid bolted-clamp grooved pipe coupling, available 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 750 psi (MPN…

SKU 3G-OTH-468323

Brand
GRUVLOK
Item
Rigid Coupling 3 in x 3 in Ductile Iron NBR Seal 750 psi
Category
Grooved Pipe Couplings
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

GRUVLOK
Manufacturer Part Number
390213458
Type
3 in x 3 in, Ductile Iron, NBR Seal, 750 psi
Fitting Pipe Size
3 in x 3 in
Maximum Operating Pressure
750 psi

Technical Documents

No technical documents available for this product.
Request documentation
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

GRUVLOK Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The GRUVLOK Rigid Coupling is a rigid bolted-clamp grooved pipe coupling, available 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 750 psi (MPN 390213458).

Frequently Asked Questions

What is a GRUVLOK rigid coupling used for?

A GRUVLOK rigid coupling joins grooved-end pipe in fire protection, HVAC, and industrial piping systems. It provides a leak-tight, mechanically locked connection that resists axial movement, making it suitable for high-pressure applications up to 750 psi.

What are the specifications of the GRUVLOK rigid coupling 390213458?

The GRUVLOK rigid coupling (MPN 390213458) is a 3 in x 3 in rigid bolted clamp made of ductile iron with an NBR seal. It has a maximum operating pressure of 750 psi and is designed for grooved pipe connections in demanding industrial environments.

Where to buy GRUVLOK rigid couplings worldwide?

3G Electric supplies GRUVLOK rigid couplings worldwide. As a global industrial sourcing partner, we handle logistics, customs clearance, and delivery to your site. Contact us for pricing and lead time on the 3 in x 3 in model (MPN 390213458).

How to install a GRUVLOK rigid coupling?

To install a GRUVLOK rigid coupling, ensure pipe ends are clean and grooved per manufacturer specs. Place the gasket over the pipe ends, then position the coupling housing over the gasket. Insert bolts and tighten evenly to the recommended torque. Always follow the manufacturer's 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.

You might also need

Burners & Combustion Pumps & Compressors Spare Parts All Products

More from GRUVLOK

View all GRUVLOK parts
GRUVLOK
GRUVLOK
This rigid bolted-clamp grooved pipe coupling is constructed from ductile iron with an NBR seal. It is rated for a maximum operating pressure of 600 psi and is used to join grooved-end pipe in piping systems requiring a leak-tight, mechanically locked connection
This bolted ductile iron grooved pipe coupling is designed for joining grooved-end pipe in mechanical piping systems. It features an EPDM seal and a maximum operating pressure of 1,000 psi. Overall length is 4-5/8 in
GRUVLOK
This bolted ductile iron grooved pipe coupling is designed for joining grooved-end pipe in mechanical piping systems. It features an EPDM seal and a maximum operating pressure of 1,000 psi. Overall length is 4-5/8 in
This grooved pipe coupling is used to join grooved-end pipes in piping systems. It features a ductile iron housing with an EPDM seal, rated for a maximum operating pressure of 300 psi at 150°F. Suitable for applications such as fire protection, HVAC, and industrial piping
GRUVLOK
This grooved pipe coupling is used to join grooved-end pipes in piping systems. It features a ductile iron housing with an EPDM seal, rated for a maximum operating pressure of 300 psi at 150°F. Suitable for applications such as fire protection, HVAC, and industrial piping
This grooved pipe coupling joins grooved-end pipe in piping systems. It features a ductile iron housing with an EPDM seal and is rated for a maximum operating pressure of 300 psi at 150°F. The coupling provides a flexible, leak-tight connection for applications such as fire protection, HVAC, and industrial piping
GRUVLOK
This grooved pipe coupling joins grooved-end pipe in piping systems. It features a ductile iron housing with an EPDM seal and is rated for a maximum operating pressure of 300 psi at 150°F. The coupling provides a flexible, leak-tight connection for applications such as fire protection, HVAC, and industrial piping
This grooved pipe coupling joins grooved-end pipes in mechanical piping systems. Constructed of ductile iron with an NBR seal, it provides a flexible connection rated for 300 psi at 150°F. Suitable for use in fire protection, HVAC, and industrial piping applications
GRUVLOK
This grooved pipe coupling joins grooved-end pipes in mechanical piping systems. Constructed of ductile iron with an NBR seal, it provides a flexible connection rated for 300 psi at 150°F. Suitable for use in fire protection, HVAC, and industrial piping applications
This grooved pipe coupling joins 2-inch grooved-end pipe in fire protection, HVAC, and industrial piping systems. Constructed of ductile iron with an NBR seal, it provides a flexible, leak-tight connection rated for a maximum operating pressure of 300 psi at 150°F
GRUVLOK
This grooved pipe coupling joins 2-inch grooved-end pipe in fire protection, HVAC, and industrial piping systems. Constructed of ductile iron with an NBR seal, it provides a flexible, leak-tight connection rated for a maximum operating pressure of 300 psi at 150°F
This GRUVLOK grooved pipe coupling connects three 3-inch grooved-end pipes in fire protection, HVAC, and industrial piping systems. It features a ductile iron body with an EPDM seal and is rated for a maximum operating pressure of 1,000 psi
GRUVLOK
This GRUVLOK grooved pipe coupling connects three 3-inch grooved-end pipes in fire protection, HVAC, and industrial piping systems. It features a ductile iron body with an EPDM seal and is rated for a maximum operating pressure of 1,000 psi
Grooved pipe coupling with ductile iron body and EPDM seal, rated for 300 psi. Features grooved x grooved x grooved connections for joining grooved-end pipes in fire protection, HVAC, and industrial piping systems
GRUVLOK
Grooved pipe coupling with ductile iron body and EPDM seal, rated for 300 psi. Features grooved x grooved x grooved connections for joining grooved-end pipes in fire protection, HVAC, and industrial piping systems