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CNGRUV Logo CNGRUV
Industrial pipeline installation

Premium Grooved Couplings & Fittings

Engineered for reliability, safety, and fast installation in fire protection, HVAC, industrial, and construction systems. OEM customization available. Global delivery from China since 2002.

Why Choose CNGRUV?

Reliable Quality

ASTM A536 Grade 65-45-12 ductile iron construction ensures 20% higher tensile strength for high-stress environments.

Fast Installation

Grooved system allows 50% faster installation compared to welding. No hot work permits required.

Universal Application

Compatible with carbon steel, stainless steel, HDPE, and ductile iron pipes. Ideal for fire protection, HVAC, and industrial systems.

OEM Customization

Support for OEM orders with custom sizes, colors, and pressure ratings. Quality absolutely guaranteed.

Timely Delivery

Stereoscopic warehouse with large storage capacity ensures fast shipment and reliable global delivery.

CNGRUV Manufacturing Facility

About CNGRUV

CNG (Hebei DIKAI Piping Products Co., Ltd) was founded in 2002 and is one of the earliest enterprises in China to develop grooved fittings. With over two decades of experience, we have established ourselves as a leading manufacturer in the pipeline products industry.

Our advanced casting technology and strict quality control ensure dimensional accuracy and reliability across all grooved products. We serve a wide range of industries including construction, fire protection, petrochemicals, and water treatment.

2002

Founded in Hebei, China

15+ Countries

Global presence

UL/FM Listed

Certified products

15-Day Lead Time

Fast production & delivery

Our Product Range

After more than a decade of experience in grooved-connected pipelines, CNG has developed products with multi-gauge and multi-pressure ratings for use with different pipe materials.

Rigid Coupling

Rigid Coupling

  • • 1GS Standard & Ductile Iron
  • • Secure connections for construction
  • • High-pressure applications
  • • UL/FM listed options
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Flexible Coupling

Flexible Coupling

  • • Ductile Iron & Stainless Steel
  • • High Pressure options
  • • Accommodates minor misalignment
  • • Ideal for vibration-prone systems
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Reducing Flexible Coupling

Reducing Flexible Coupling

  • • ASTM A536 compliant
  • • Connects pipes of different sizes
  • • Maintains integrity under pressure
  • • Flexible for thermal expansion
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Grooved Mechanical Tee

Grooved Mechanical Tee

  • • ASTM-certified
  • • FM/UL listed
  • • 50% faster than welding
  • • For fire protection & HVAC
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90° Elbow

90° Elbow

  • • 90°, 45°, 22.5°, 11.25° options
  • • Reducing elbow available
  • • Ductile iron construction
  • • For tight space installations
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Equal Tee

Equal Tee

  • • ASTM-certified
  • • 500 PSI rating
  • • Stainless steel & ductile iron
  • • Bulk discounts available
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End Cap

End Cap

  • • ASTM A-536 Grade 65-45-12
  • • Concentric & eccentric types
  • • Corrosion-resistant
  • • Seals pipeline ends securely
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Split Flange

Split Flange

  • • Easy installation without rotation
  • • For tight or confined spaces
  • • Compatible with standard flanges
  • • Reduces downtime
View Details

Our Completed Projects

Collaborated projects spread all over the world

National Stadium - Bird's Nest

Beijing Daxing International Airport

Guangzhou Baiyun Airport

Qingdao Metro

Shandong Provincial Government Office

Wuhan Greenland Center

Qingdao Wanda Film Base

Hangzhou Trade Wisdom Gate

Shandong Haiyang Nuclear Power

Yangmei Group Coal Mine

Quality Control & Testing

We maintain strict quality assurance through advanced laboratories and precision equipment. Every product undergoes rigorous testing to meet international standards.

Metalloscope

Material structure analysis

Lab 1 & Lab 2

Dimensional & pressure testing

UL/FM Listed

Certified for fire protection

500 PSI Rating

High-pressure performance

Quality Control Lab

News Center

Stay updated with CNGRUV developments

Oct. 22, 2025

Rigid vs Flexible Coupling: Differences & Applications

Couplings are essential in mechanical power transmission. Selecting the right type ensures reliability and longevity of machinery.

Read More →
Oct. 22, 2025

Steel vs Aluminum Rigid Coupling: Strength & Weight

Material choice plays a critical role in performance. Steel offers strength; aluminum provides lightweight efficiency.

Read More →
Jul. 17, 2024

Sao Paulo International Exhibition

We participated in one of Brazil's largest exhibition centers, showcasing our latest grooved coupling innovations.

Read More →

Looking for Stable Long-Term Partnerships

We seek reliable partners to grow our business together. Contact us to explore partnership opportunities.

Contact Us →

Contact CNGRUV

For product inquiries, OEM customization, bulk orders, or partnership opportunities, visit our official website to get in touch.

Contact Information

Phone: +86 136 0317 2196

Email: gm@cngcast.com

Address: Economic Development Zone, Mengcun County, Cangzhou City, Hebei Province, China

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