Backing Ring for IPS & Pipe
Two-piece backing rings install around existing stub ends and backing rings — no cutting the pipe, no re-welding. Sized for IPS and standard pipe.
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Interlocking Split Flanges
A Smarter Approach to
Pipe Installation & Repair
Get online faster and safer with Marzolf interlocking flanges. No cutting, no re-welding, no unnecessary downtime.
1955Established
Made in the USAWhatever the Job Demands
From New Construction to Critical Repairs
Whether you're bringing a new system online, performing scheduled maintenance, or responding to an unexpected failure, reducing downtime and improving worker safety are always priorities. Marzolf Interlocking Flanges help facilities complete work more efficiently and keep operations moving.
Contact UsLet's Talk · (715) 426-5705
Made in the USA Since 1955
Engineered For The Demands of Fluid Processing
Since 1955, Marzolf has manufactured and supplied American-made interlocking split flanges for fluid processing facilities across North America. Our innovative two-piece designs eliminate cutting and rewelding, helping teams streamline new installations, simplify maintenance, and complete repairs with less downtime and risk.
Contact UsLet's Talk · (715) 426-5705
No Cutting. No Rewelding.
Built for Faster, Safer Installations & Repairs
Marzolf interlocking flanges install after your stub ends or backing rings are already fused, welded, or glued in place, so you reassemble around the pipe instead of rebuilding it. Below: a look at the components that make it possible.
Fiberglass Backing Ring
Lightweight, corrosion-resistant backing for fiberglass and composite pipe used in chemical and water service.
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PVC & CPVC Backing Rings
Split backing rings sized for thermoplastic systems. No solvent-weld rework, fast changeouts.
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PVC Replacement Ring
A drop-in replacement ring that gets a damaged flange collar back in service without replacing the full assembly.
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Large-Diameter HDPE
Heavy-duty interlocking flanges for large-diameter polyethylene mains and force mains.
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Pipe Stub End
Van Stone style stub end paired with Marzolf split flanges for a rigid, reusable connection.
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Marzolf Benefits
Minimal Downtime
Faster repairs that reduce downtime, limit operational disruption, and help maintain productivity during critical events.
Lower Labor Cost
A two-piece design that simplifies installation, reduces labor demands, and helps teams complete repairs safely and efficiently.
Increased Safety
Less cutting and welding exposure means a safer work environment and lower risk during critical repair activities.
Faster Installation
Engineered for fast installation, reducing labor requirements while accelerating repairs and restoring production schedules sooner.
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Industries We Serve
Trusted by Fluid Processing Industries Nationwide
For seventy years, Marzolf flanges have helped plants, mills, and utilities across the country get back online faster, wherever fluids move through pipe.
Chemical & Fluid Processing
Corrosion-resistant backing rings and split flanges rated for aggressive chemical service and demanding process loops.
Water Utilities
Reliable, fast-install connections for treatment plants and distribution, built to keep potable and process water moving.
Food & Beverage Processing
Stainless and thermoplastic options suited to sanitary, washdown-heavy food and beverage environments.
Municipalities & Wastewater
Large-diameter HDPE and PVC solutions for lift stations, force mains, and collection-system repairs.
Power Generation
Rigid, high-integrity flange connections engineered to keep cooling, steam, and process systems in service.
Oil & Gas
Heavy-wall interlocking flanges built for the pressures and uptime demands of hydrocarbon handling.
Heritage
Seventy Years of Trusted Relationships
George B. Marzolf Sr. patented the original interlocking flange, and the company he founded in 1955 still builds them in River Falls, Wisconsin.
70+
Years in Business
5.00
Customer Rating
“We swapped in Marzolf split flanges during a scheduled outage and cut days off the reassembly. No cutting, no re-welding. Exactly what they promised.”
Maintenance Lead
Midwest Pulp & Paper Mill
“Their two-piece design has become our standard for HDPE repairs. The crew can install them in place after the stub ends are fused, which keeps everyone safer.”
Plant Engineer
Regional Water Utility
“Responsive, made in the USA, and they had the large-diameter rings on a truck fast. Marzolf understands what uptime actually costs us.”
Operations Manager
Chemical Processing Facility
Get In Touch With Us
Have a project or a concern you'd like to discuss? Call us. We'd love to talk with you.