Indiana Seal

What Indiana Seal does

Indiana Seal is a Fargo, North Dakota-based manufacturer of flexible PVC pipe couplings, founded in 1981 and operating as a subsidiary of GPK Products, Inc. since its 2007 acquisition. The company engineers and fabricates couplings and related fittings designed to connect dissimilar pipe materials (clay, cast iron, ductile iron, concrete, and PVC) in sizes ranging from 1 1/4 inches to 42 inches, with custom dimension fabrication available. Core products include Clay-to-Clay couplings, Clay-to-CI/PVC couplings, Concrete-to-Concrete couplings, Shearguards, Reducers, Seal Caps, Compression Seals, Saddles, Adapters and Connectors, Hose Clamps, Shear Rings, Fast Branch Tees, and supporting installation tools. All couplings are made of tough, pliable PVC formulated to withstand sewer gases, chemicals, fungus growth, soil conditions, roots, and other inground hazards.

Indiana Seal operates a hardware sales revenue model, pricing products per unit with carton and crate volume discounts (e.g., Part #101-44 at $28.97 list; Part #101-88 at $95.29 list). Distribution is delivered through a network of US warehouses and 25+ independent sales representative companies covering defined US and Canadian territories, with order tracking integrated with UPS and CH Robinson LTL carriers. The customer base spans contractors, municipalities, plumbers, and construction professionals serving municipal sewer systems, commercial construction, and infrastructure projects.

The company holds multiple sector-specific compliance certifications relevant to its end markets, including IAPMO product listings (couplings and Shearguards), AIS (American Iron and Steel) compliance for federally funded water projects, and BABA (Build America, Buy America) compliance for federally funded infrastructure procurement. Operations are integrated with parent GPK Products, Inc., sharing warehouses, manufacturing methods, and customer service infrastructure.

Name

Indiana Seal

Legal name

Indiana Seal

Website

https://indiana-seal.com

Company type

Private

Founded year

1981

Operating status

Operating

Headcount range

11–50 employees

Short description

Indiana Seal is a Fargo, North Dakota-based manufacturer of flexible PVC pipe couplings serving contractors, municipalities, and infrastructure projects across the US and Canada. Founded in 1981 and operating as a subsidiary of GPK Products, Inc. since 2007, the company produces couplings in sizes from 1 1/4 to 42 inches.

Ownership category

akta.pro rank

Product category

Pipe Couplings & Fittings Manufacturing

NAICS

Plastics Pipe and Pipe Fitting Manufacturing (326122), Plastics Pipe, Pipe Fitting, and Unlaminated Profile Shape Manufacturing (32612)

SIC

Gaskets, Packg & Sealg Devices & Rubber & Plastics Hose (3050)

akta.pro primary industry

Pipe Fittings, Couplings & Connectors (IMADALAD)

akta.pro secondary industries

Pipe Accessories & Joining Systems (Couplings, Gaskets, Solvent Cement, Fusion Fittings) (IMANADAJ), Water & Sewer Pipe & Fittings (PVC/HDPE/PP) (IMANADAA), Plumbing & Building Drain/Waste/Vent (DWV) Pipe & Fittings (IMANADAG)

Keywords

• Flexible PVC couplings
• Pipe coupling manufacturing
• Underground pipe fittings
• Sewer pipe couplings
• Custom PVC fabrication

Headquarters

HQ city

Fargo

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Marketing or Sales, Technology or R&D

Revenue model

1. PVC Coupling and Fitting Sales: Sale of flexible PVC pipe couplings, fittings, and related products. Products include various coupling types, reducers, seal caps, well traps, compression seals, saddles, adapters, hose clamps, shear rings, and tools. Pricing is per unit with volume discounts available through carton and crate quantities.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels3 records

Core offering

Indiana Seal engineers and fabricates flexible PVC pipe couplings that connect dissimilar pipe materials — including clay, cast iron, ductile iron, concrete, and PVC — for underground sewer, drain, and infrastructure applications. Standard sizes range from 1¼ inches to 42 inches, with full custom-dimension fabrication available, and the product line extends to Shearguards, reducers, seal caps, compression seals, saddles, adapters, hose clamps, shear rings, and branch tees. All couplings are made of tough, pliable PVC engineered to resist sewer gases, chemicals, fungus growth, soil conditions, and root intrusion, with production overseen by an AI-certified in-house Quality Control Department.

Product overview

Indiana Seal is a manufacturer of flexible PVC pipe couplings serving the piping industry. Their core product is flexible PVC couplings available in sizes from 1 1/4 inches to 42 inches, with custom sizing capabilities. The product portfolio includes various coupling types (Clay to Clay, Clay to CI/PVC, Concrete to Concrete, etc.), Shearguards, Reducers, Seal Caps, Compression Seals, Saddles, Adapters and Connectors, Hose Clamps, Shear Rings, and Fast Branch Tees with supporting tools. All couplings are made of tough, pliable PVC designed to withstand sewer gases, chemicals, fungus growth, soil conditions, and roots.

Differentiator

Problem solved

Functional benefit

Products and services

• Flexible PVC Couplings Flexible PVC pipe couplings in standard sizes from 1¼ inches to 42 inches (with custom dimensions available) that connect dissimilar pipe materials — clay, cast iron, ductile iron, concrete, and PVC — for underground sewer, drain, and infrastructure applications; engineered to resist sewer gases, chemicals, fungus growth, soil conditions, and roots.
• Clay-to-Clay Couplings Flexible couplings designed to join clay pipe to clay pipe in underground sewer and drain systems.
• Clay-to-CI/PVC Couplings Flexible couplings engineered to connect clay pipe to cast iron or PVC pipe, addressing transitions between legacy and modern piping materials.
• Concrete-to-Concrete Couplings Flexible couplings for joining concrete pipe to concrete pipe in stormwater and sewer applications.
• Shearguards (shear ring couplings) Protective couplings incorporating shear ring technology to reinforce pipe connections in demanding underground conditions; Shearguards carry IAPMO listing (onset-iapmo-product-listing-8-21).
• Reducers Flexible PVC reducers that join pipes of different diameters, offered in various material combinations (e.g., clay, cast iron, PVC).
• Seal Caps Cap fittings used to seal pipe ends in underground sewer and drain lines.
• Compression Seals Compression seals designed for cast iron, extra heavy cast iron, clay, and concrete pipe joints.
• Saddles Flexible saddle tees and wyes used to create branch connections in existing pipe systems.
• Adapters and Connectors Range of adapters and connectors including shower drain, drain and trap, tubular drain, universal sewer, downspout, utility, and manhole adapters for transitioning between dissimilar pipe or fixture types.
• Hose Clamps AIS-compliant and universal hose clamps used to secure coupling and pipe connections, with AIS-compliant versions available.
• Shear Rings Amazon shear rings and AIS-compliant Amazon shear rings that reinforce pipe coupling connections in demanding applications.
• Fast Branch Tees Fast branch tees for IPS and PSM pipe applications, available in multiple adapter configurations for branch connections.
• Installation Tools Hole saws, arbors, and coring bits sold to support proper installation of Indiana Seal coupling products.

Quantifiable outcome

• Quick and efficient production turnaround
• +1 more outcomes

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

One partnership is on record.

• GPK Products, Inc.coreOthers · 1 January 2007In 2007, GPK Products, Inc. purchased Indiana Seal, creating a synergistic connection between the two companies. This allowed Indiana Seal to utilize GPK's warehouses, methods, and customer service standards, increasing overall quality, production, and timeliness of manufacturing. Together, Indiana Seal and GPK are one company with two exceptional product lines.

Scale indicators3 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• Fernco (Fernco Flexible Couplings): Fernco is the leading US manufacturer of flexible PVC pipe couplings and connectors used in sewer, drain, and storm applications. Directly competes with Indiana Seal in flexible couplings connecting dissimilar pipe materials across similar municipal and contractor channels.
• GPK Products, Inc. GPK Products is Indiana Seal's parent company and an industry leader in PVC fittings based in Fargo, ND since 1972. Operates in the same PVC pipe fittings category with shared warehousing, manufacturing methods, and customer service infrastructure.
• Mission Rubber Company (Mission Couplings): Mission Rubber manufactures flexible rubber and PVC couplings, donut connectors, and pipe seals for sewer, drain, and plumbing applications. Competes directly with Indiana Seal in flexible transition couplings for dissimilar pipe materials.

Broad incumbents

• IPEX (Aliaxis): IPEX, part of Aliaxis, is a major North American manufacturer of PVC, CPVC, PP, and PE pipe, fittings, and engineered systems for plumbing, irrigation, industrial, and municipal applications. Broad incumbent with significant overlap in PVC pipe fittings where Indiana Seal competes.
• Charlotte Pipe and Foundry: Charlotte Pipe is one of the largest US manufacturers of PVC, CPVC, and cast iron pipe and fittings serving plumbing, irrigation, and industrial markets. A broad incumbent whose coupling and DWV fittings portfolio overlaps with Indiana Seal at the wholesale distribution level.
• Cresline Plastic Pipe Co. Cresline is an established US manufacturer of PVC and HDPE pressure pipe, sewer pipe, and related fittings. Overlaps with Indiana Seal's PVC pipe fittings offering for water, sewer, and irrigation distribution.
• NIBCO INC. NIBCO is a large US manufacturer of plumbing valves, fittings, and flow-control products in copper, CPVC, PVC, and metal. Overlaps with Indiana Seal in plastic fittings and couplings distributed through plumbing wholesalers serving contractors and municipalities.

Emerging players

• Trelleborg Pipe Seals: Trelleborg Pipe Seals produces rubber and polymer-based sealing systems for wastewater, stormwater, and potable water pipe networks, including coupling gaskets and seals. Comparable to Indiana Seal in the inground pipe sealing/jointing technology layer.
• Plastic Trends: Plastic Trends manufactures specialty PVC fittings, couplings, and fabricated pipe components for sewer, drain, and infrastructure applications. Smaller specialty competitor comparable to Indiana Seal in custom PVC coupling fabrication for niche and engineered orders.

Regional players

• Canplas (Aliaxis): Canplas is a Canadian manufacturer of PVC fittings, couplings, and plumbing accessories primarily serving the Canadian market. Regional peer with overlapping PVC coupling product lines, comparable to Indiana Seal's Canadian footprint.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/pages/category/Company/GPK-Products-IncIndiana-Seal-Company-781297088692720

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Indiana Seal