High-Density Polyethylene Piping Products
HDPE fittings: industry-best selection and capabilities.
Molded, fabricated, and electrofusion, ISCO offers the largest inventory of high-performance HDPE fittings engineered for reliability across industries.
Why choose ISCO's HDPE fittings?
Keep your pipe system moving
ISCO’s HDPE fittings are manufactured to meet or exceed ASTM standard. From water and industrial applications to natural gas and specialty pipe systems, our fittings connect your project to proven long-term performance.
ISCO offers the largest selection of HDPE fittings in North America, including molded, electrofusion, and fabricated options. With coast-to-coast distribution and deep inventory, we keep projects moving by delivering pipe fittings when and where you need them.
All fittings are manufactured from PE4710 resin and engineered to align with ASTM standards: D3261 for molded, F1055 for electrofusion, and F2206 for fabricated. Pressure ratings vary by size and SDR, ensuring reliable, leak-free performance in water, natural gas, industrial, and other pipeline applications.
Beyond standard fittings, ISCO provides engineered solutions through our fabrication facilities. We build custom spools, manifolds, and complex assemblies, with documentation and quality control available on request to support compliance and project assurance.
Our team doesn’t just supply fittings—we stand behind them. ISCO offers on-site technical support, fusion training programs, and responsive engineering assistance to help contractors, utilities, and engineers get the most from HDPE pipe systems.
Range of HDPE fittings
HDPE Molded Fittings
Molded HDPE fittings provide reliable quality and integral reinforcement that withstands stress. ISCO offers a full line of pressure-rated HDPE butt fusion fittings, molded and reinforced at the bend, branch or reduction point for optimum strength and long-term performance.
HDPE Fabricated Fittings
ISCO designs and fabricates HDPE fittings in virtually any size or configuration including fabricated elbows, flanges, reducers, tees, large-diameter fittings, and custom or unique shapes to meet your pipe system requirements.
FM-Approved Fittings
FM-approved fittings for fire protection piping systems used in industrial, mission-critical, and other applications that meet FM Global’s rigorous criteria and standards, ensuring each component can withstand extreme conditions and perform reliably.
Electrofusion Fittings
Electrofusion fittings used in gas and water distribution, industrial pipe systems and uses where leak-free reliablility is critical. ISCO molds its EF fittings from virgin, PPI-listed resin for max performance—designed to meet or exceed ASTM standards.
Custom Built Fittings
Specialty and custom HDPE transition fittings, large-diameter fittings, dual-containment, high-pressure fittings, restraint fittings, swaged fittings for even the most demanding pipe applications. ISCO offers a range of pipe fittings for specific functions or environments.
Natural Gas HDPE Fittings
Natural gas fittings designed for reliable performance. Molded, fabricated, and EF fittings manufactured from PE4710 meet ASTM D2513 and related standards (F1055, D3261, F2206), like hot tapping valves, line-stopping fittings, valves, and steel fittings.
Browse Our Product Catalog.
Pipe, fittings, accessories, and more.
Download Our HDPE CADs.
Streamline your design process.
Find your HDPE fitting
From butt fusion to electrofusion, specialty to custom fabricated fittings, no other HDPE provider has our combination of in-stock inventory, capabilities and expertise. We have or can fabricate any pipe fitting type—all engineered to meet or exceed ASTM, ISO and FM standards. For our full range of fittings offerings, download our product catalog.
ELBOWS (45°, 90°)
Configuration
Molded or fabricated
Size Range
2"– 63" OD
DR:
7–32.5
Pressure Rating Range:
50–335 psi
HDPE TEES
Configuration
Straight tee
Size Range
2"– 63" OD
DR:
7–32.5
Pressure Rating Range:
50–250 psi
HDPE REDUCING TEES
Configuration
Multiple branch/size combos
Size Range
3"×2" – 48"×12"
DR:
7–32.5
Pressure Rating Range:
63–335 psi
HDPE WYE (Y-BRANCH)
Configuration
45° wye (typical)
Size Range
2"–63" OD
DR:
7–17
Pressure Rating Range:
63–167 psi
HDPE CROSS FITTING
Configuration
Four-way intersection
Size Range
2"–24" OD
DR:
7–17
Pressure Rating Range:
63–200 psi
CONCENTRIC REDUCER
Configuration
Concentric transition
Size Range
1"×1/2" – 63"×54"
DR:
7–32.5
Pressure Rating Range:
63–335 psi
FLANGE ADAPTERS
Configuration
HDPE-to-flanged transition
Size Range
3/4"–63"
DR:
7–32.5
Pressure Rating Range:
63–335 psi
HDPE END CAPS
Configuration
Cap/closure
Size Range
2"–42" OD
DR:
7–32.5
Pressure Rating Range:
63–335 psi
MECHANICAL JOINT (MJ) ADAPTERS
Configuration
HDPE-to-MJ transition
Size Range
2"–48"
DR:
9–17
Pressure Rating Range:
125–250 psi
HDPE CROSS FITTING
Configuration
Four-way intersection
Size Range
2"–24" OD
DR:
7–17
Pressure Rating Range:
63–200 psi
TAPPING TEES
Configuration
Standard & high-volume
Mains / Outlets
2"–24", ½"–2"
DR:
7–17
Pressure Rating Range:
63–200 psi
COUPLINGS
Configuration
Molded & EF
Size Range
½" – 63"
DR:
7–32.5
Pressure Rating Range:
63–335 psi
Questions? Want to Request a Quote?
Whether you need a single-fitting solution or complete system of HDPE fittings, we're hear to help. Let us answer your questions and recommend the right fitting(s) to fit your performance piping needs.
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Custom fabrication
Specialized HDPE design and fabrication expertise and experience, tailored to your unique project needs.
Expertise and support
Learn about ISCO’s full-spectrum expertise and support, from consultation and ideation to fabrication and installation.
