MarMac Dissimilar Pipe Couplers (DP Couplers) are engineered to join, seal, and restrain the connections between pipes of differing material and/or pipes of varying nominal size*. These unique, external sealing bands are reinforced and prevent infiltration into gravity-flow drainage systems.
*While dependent upon pipe material(s) and/or overall pipe diameter(s), the difference in diameter must not exceed 15% or 8″ to allow for proper step-down.
DP Couplers integrate several unique components into a single, customizable, full-perimeter, external sealing band. Our specially-formulated, rubberized mastic aggressively adheres to all known pipe surfaces, providing a positive seal to battle infiltration. The coupling is reinforced with a sheet of durable, woven polypropylene which provides shear and puncture resistance. They are constructed with four integrated compression bands, which when tightened, form a mechanical seal, permanently bonding the mastic to the pipe wall.
Size: 8"
Some of our most popular pipe jointing scenarios are below. This is by no means a comprehensive list or a suggestion that these connections perform better than others. Dissimilar Pipe Couplers are able to connect virtually any structurally sound pipe material with another. DP Couplings are also a great choice for two pipes of the same material, but with differing nominal diameter. The aforementioned diameters however, must be reasonably close to account for proper step-down/reduction.
RCP to HDPE/HDPP
CMP to HDPE/HDPP (Must note if CMP has annular / re-rolled or spiral /non-rerolled ends)
CMP to RCP (Must note if CMP has annular / re-rolled or spiral / non-rerolled ends)
PVC to HDPE/HDPP
***SPECIAL ORDER***
***Non-cancellable and non-returnable***
Strong, permanent, shear & puncture resistant
Easily installed & immediately inspectable
Tens of thousands in use today with nearly a 100% success rate
Full-perimeter, positive seal = infiltration-proof
Specially formulated mastic layer
Heavy-duty, high quality construction
SPECIFICATION
DP Couplers are strategically manufactured with cross-laminated polyethylene, woven polypropylene, rubberized “cold-flow” mastic, as well as integrated compression bands, similar to MarMac’s PolySeal couplers. DP Couplers are three-ply with a total thickness of approximately 180 mils.
INSTALLATION
The coupler shall be placed around the pipe, mastic side to the pipe, spanning the joint. The protective release film shall be removed and the coupler applied with the overlap at the top of the pipe. The straps shall be secured (outside straps first) on the larger outside diameter pipe (when applicable) with the proper tools. Then, the straps on the outside of the smaller outside diameter pipe shall be secured. The inside straps shall be tightened last. The closing flap shall cover the exposed strap work area, completing the joint.
CAUTION: *All statements and technical information are based on tests and/or data which MarMac Manufacturing deems reliable, however, MarMac does not warrant or guarantee the accuracy or completeness of such information. Please read further manufacturer liability and warranty information.
MarMac PolySeal is a flexible, high-strength pipe coupling that permanently seals and restrains corrugated plastic pipe. PolySeal Couplers are over-engineered, reinforced external joint seals designed to connect HDPE / HDPP corrugated pipe, while remaining both infiltration proof and exfiltration resistant. PolySeal Couplings are perfect for cut & butt joints, field repairs, new detention systems, and more.
MarMac’s Standard PolySeal is a high performance, external joint coupler designed for the prevention of infiltration and resistance of exfiltration at joints of common HDPE & HDPP corrugated pipe.
Our standard PolySeal coupler has three integrated compression bands. Sizes under 30″ are standard-duty and use hose clamp bands made of high-strength 409 or 304 stainless steel. Heavy-duty sizes over 30″ contain an additional membrane layer of polyethylene and mastic, and utilize built-in ratchet straps.
Fits corrugated HDPE & HDPP pipe
Size: 8"
Compression Bands: 3 Hose Clamp Bands
Infiltration-proof exfiltration-resistant
Easily installed & immediately inspectable
Millions installed today with nearly a 100% success rate
Permanent protection with proven performance
Strong, shear & puncture-resistant
SPECIFICATION
PolySeal is manufactured with interval layers of our rubberized mastic, specially formulated to adhere aggressively to all known pipe surfaces. A sheet of puncture and shear-resistant woven polypropylene, and an outside backing of cross-laminated polyethylene makes PolySeal resistant to most acids and bases (additional protection available with Chemical Resistant PolySeal). The integrated compression bands mechanically “lock” into the corrugations of the pipe, bonding the mastic to the pipe wall, and forming a permanent seal.
The minimum length of a PolySeal Coupler is the circumference of the outside diameter of the pipe, plus eight inches for overlap.
INSTALLATION
Surface preparations: Inspect the outside of the joint. Brush surface as needed to ensure it is free of debris. If installing on horizontal pipe, dig a bell hole for complete access to the joint.
The coupler shall be placed around the pipe with the mastic side to the pipe wall and spanning the joint, while centered on the joint gap to be sealed. The protective film shall be removed and the coupler applied with the overlap at the top of the pipe. The tensioning straps shall be aligned between the pipe corrugations and tightened. The closing flap protective film shall be removed and the closing flap shall cover the exposed straps and the work area.
CAUTION: *All statements and technical information are based on tests and/or data which MarMac Manufacturing deems reliable, however, MarMac does not warrant or guarantee the accuracy or completeness of such information. Please read further manufacturer liability and warranty information.
MarMacʼs Chemical Resistant PolySeal (PolySeal CR) is specified for stormwater and sanitary sewer gravity-flow applications. When installed in contaminated soils (principally hydrocarbon-based), PolySeal CR will prevent inflow/infiltration and exfiltration into the joint in which it is installed. It is designed to maintain the joint integrity, including in less than perfect bedding conditions.
Chemical Resistant PolySeal (PolySeal CR) uses a proprietary, co-extruded, multi-layer barrier film lamination on the outside of the coupler. This film has been tested per ASTM F739 against a battery of chemicals at 95% concentration for permeation resistance with excellent results, including Benzene, Toluene and other hydrocarbon based solvents.
PolySeal Couplings are perfect for cut & butt joints, field repairs, new detention systems, and more.
Fits corrugated HDPE & HDPP pipe
Available Sizes: 4" - 60"
Standard or Double-Wide
APPLICATIONS
Sanitary Sewer
Elevated hydrocarbon environments
Contaminated soil
Airport detention systems
SPECIFICATION
The structure of PolySeal CR includes a proprietary, co-extruded, multi-layer barrier film which is laminated to the exterior of the coupler. This film has been tested per ASTM F 739 against a battery of chemicals at 95% concentration for permeation resistance with excellent results, including benzene, toluene, and other hydrocarbon-based solvents.
CAUTION: *All statements and technical information are based on tests and/or data which MarMac Manufacturing deems reliable, however, MarMac does not warrant or guarantee the accuracy or completeness of such information. Please read further manufacturer liability and warranty information.
