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

3G Electric
RFQ CartGet a QuoteSign inSign up
Image not available
GRUVLOKGrooved Pipe Couplings

GRUVLOK Rigid Coupling: Rigid Bolted Clamp, 3 in x 3 in, Ductile Iron, EPDM Seal

The GRUVLOK Rigid Coupling is a rigid bolted-clamp grooved pipe coupling in a 3 in x 3 in size, constructed of ductile iron with an EPDM seal and rated for a maximum operating pressure of 750 psi. 3G Electric…

SKU 3G-OTH-468320

Brand
GRUVLOK
Item
Rigid Coupling: Rigid Bolted Clamp, 3 in x 3 in, Ductile Iron, EPDM Seal
Category
Grooved Pipe Couplings
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
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

Technical Specifications

GRUVLOK
Manufacturer Part Number
390213210
Type
3 in x 3 in, Ductile Iron, EPDM Seal, 750 psi
Fitting Pipe Size
3 in x 3 in
Maximum Operating Pressure
750 psi
View Full Spec Sheet

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 in a 3 in x 3 in size, constructed of ductile iron with an EPDM seal and rated for a maximum operating pressure of 750 psi. 3G Electric interprets this demand, sources the genuine GRUVLOK part (MPN 390213210), and supports your project across 14 industrial departments — with specialist depth in combustion, pumps and controls as an authorised distributor.

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 rated for 750 psi, suitable for high-pressure water, air, and other non-corrosive services.

What are the specifications of the GRUVLOK rigid coupling 390213210?

The GRUVLOK rigid coupling (MPN 390213210) is a 3 in x 3 in rigid bolted clamp made of ductile iron with an EPDM seal. It has a maximum operating pressure of 750 psi and is designed for grooved pipe connections in demanding industrial applications.

Where to buy GRUVLOK rigid couplings worldwide?

3G Electric supplies genuine GRUVLOK rigid couplings worldwide. We handle full logistics, customs clearance, and delivery to your site. As a global industrial solutions provider, we source the exact part (MPN 390213210) and support your project across 14 departments.

How to install a GRUVLOK rigid coupling?

To install a GRUVLOK rigid coupling, ensure pipe ends are clean and grooved per manufacturer specs. Lubricate the EPDM gasket, place it over the pipe ends, then position the coupling housing and tighten bolts 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.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

More from GRUVLOK

View all GRUVLOK parts →
GRUVLOK Clamp Coupling: Clamp, 2 in x 2 in, Ductile Iron, EPDM Seal, 300 psi @ 150° F (MPN 0390010007). Key specifications — Brand: GRUVLOK; Maximum Operating Pressure: 300 psi @ 150° F; Fitting Pipe Size: 2 in x 2 in.
GRUVLOK
GRUVLOK Clamp Coupling: Clamp, 2 in x 2 in, Ductile Iron, EPDM Seal, 300 psi @ 150° F (MPN 0390010007). Key specifications — Brand: GRUVLOK; Maximum Operating Pressure: 300 psi @ 150° F; Fitting Pipe Size: 2 in x 2 in.
GRUVLOK Clamp Coupling: 1 1/2 in x 1 1/2 in, EPDM Seal, 300 psi, Ductile Iron, Bolted, 4 7/8 in Lg (MPN 0390211498). Key specifications — Maximum Operating Pressure: 300 psi; Brand: GRUVLOK.
GRUVLOK
GRUVLOK Clamp Coupling: 1 1/2 in x 1 1/2 in, EPDM Seal, 300 psi, Ductile Iron, Bolted, 4 7/8 in Lg (MPN 0390211498). Key specifications — Maximum Operating Pressure: 300 psi; Brand: GRUVLOK.
GRUVLOK
GRUVLOK
GRUVLOK Rigid Coupling: Rigid Bolted Clamp, 5 in x 5 in, Ductile Iron, EPDM Seal, 750 psi (MPN 390213214). Key specifications — Brand: GRUVLOK; Maximum Operating Pressure: 750 psi; Fitting Pipe Size: 5 in x 5 in.
GRUVLOK Metal Pipe Straight: Straight, 8 in x 8 in, Ductile Iron, EPDM Seal, 750 psi @ 150°F (MPN 0390013571). Key specifications — Brand: GRUVLOK; Maximum Operating Pressure: 750 psi @ 150°F; Fitting Pipe Size: 8 in x 8 in.
GRUVLOK
GRUVLOK Metal Pipe Straight: Straight, 8 in x 8 in, Ductile Iron, EPDM Seal, 750 psi @ 150°F (MPN 0390013571). Key specifications — Brand: GRUVLOK; Maximum Operating Pressure: 750 psi @ 150°F; Fitting Pipe Size: 8 in x 8 in.
GRUVLOK Clamp Coupling: Clamp, 6 in x 6 in, Ductile Iron, EPDM Seal, 300 psi @ 150° F (MPN 0390000404). Key specifications — Brand: GRUVLOK; Maximum Operating Pressure: 300 psi @ 150° F; Fitting Pipe Size: 6 in x 6 in.
GRUVLOK
GRUVLOK Clamp Coupling: Clamp, 6 in x 6 in, Ductile Iron, EPDM Seal, 300 psi @ 150° F (MPN 0390000404). Key specifications — Brand: GRUVLOK; Maximum Operating Pressure: 300 psi @ 150° F; Fitting Pipe Size: 6 in x 6 in.
GRUVLOK
GRUVLOK
GRUVLOK Rigid Coupling: Clamp, 8 in x 8 in, NBR Seal, 600 psi, Ductile Iron, Grooved x Grooved (MPN 390213666). Key specifications — Maximum Operating Pressure: 600 psi; Brand: GRUVLOK.
GRUVLOK Metal Pipe Straight: Straight, 4 in x 4 in, Ductile Iron, EPDM Seal, 300 psi @ 150° F (MPN 0390003085). Key specifications — Brand: GRUVLOK; Maximum Operating Pressure: 300 psi @ 150° F; Fitting Pipe Size: 4 in x 4 in.
GRUVLOK
GRUVLOK Metal Pipe Straight: Straight, 4 in x 4 in, Ductile Iron, EPDM Seal, 300 psi @ 150° F (MPN 0390003085). Key specifications — Brand: GRUVLOK; Maximum Operating Pressure: 300 psi @ 150° F; Fitting Pipe Size: 4 in x 4 in.
GRUVLOK
GRUVLOK
GRUVLOK Rigid Coupling: Clamp, 5 in x 5 in, EPDM Seal, 750 psi, Ductile Iron, Grooved x Grooved (MPN 390213614). Key specifications — Maximum Operating Pressure: 750 psi; Brand: GRUVLOK.