The Right Way to Join Pipes of Different Materials
Common Connections
MarMac Dissimilar Pipe (DP) Couplers are reinforced, rubberized mastic, external sealing bands that are engineered to join, seal, and restrain the connections between pipes of differing material and/or pipes of a similar nominal size*, while preventing infiltration into the gravity-flow drainage system.
With hundreds of designs, MarMac DP Couplers are able to join virtually any scenario of pipe combinations. Our most commonly joined pipe materials are reinforced concrete pipe (RCP), corrugated metal pipe (CMP), corrugated plastic pipe (HDPE/HDPP), ductile iron (DI), PVC pipe, vitrified clay pipe, and more. Additionally, DP Couplers make a great choice for connecting BMP separator systems.
The minimum length of a DP Coupler is the circumference of the larger outside diameter (if applicable) plus eight inches for overlap. MarMac Dissimilar Pipe Couplers are easy to install, cost-efficient, permanent, readily available, and fully customizable.
* The typical maximum size difference of pipes is 6-8”, dependent on pipe material(s) and/or overall pipe diameter(s), in order to allow for proper step-down. Please contact MarMac for more information.
Universal Dissimilar Couplers Available
Your go-to coupler for joining size-for-size pipes. From “B” wall RCP (w/o bell) down to SCH40 PVC, and every other type of pipe in that nominal size. Universal DP Couplers are heavy duty with 3-ply, 180 mil thickness, and are designed with 4-compression bands to mechanically seal the coupler to the pipe walls. A custom DP Coupler is required for any non-rerolled CMP.
Designed to Perform.
DP Couplers integrate several unique components into a single, customizable, full-perimeter, external sealing band. MarMac’s 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. An outside backing of heavy-duty, cross-laminated polypropylene protects the joint from future infiltration, acids, and bases. DP Couplers have four integrated compression bands, that when tightened, form a mechanical seal, permanently bonding the mastic to the pipe wall.
POLYETHYLENE BACKING
Heavy-duty, cross-laminated top layer, available with acid & alkali resistance
WOVEN POLYPROPYLENE
Puncture & shear resistant reinforcement layer sandwiched between mastic sealant
COMPRESSION BANDS
High-tensile compression straps tighten to create an impermeable mechanical seal
RUBBERIZED MASTIC
Specially-formulated, rubberized mastic aggressively adheres to the pipe surface
Features & Benefits
- 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
- Protection from corrosion, acids & alkali
Over the years MarMac DP Couplers have sealed tens of thousands of connections between different types and sizes of pipe. MarMac Dissimilar Couplers are the proven, permanent pipe coupling for the most challenging of installations, and the “go to” solution for when it really matters. Designed to be installed in the worst field conditions, DP Couplers always succeed where competitors’ products fail.
Our dedicated production line and unique manufacturing system allow us to quickly ship small or large quantities of DP Couplers, custom designed specifically for almost any type and size of pipe you encounter in the field. Many DP Couplers are available for shipping the same day the order is placed, and we regularly ship to job sites and/or drop ship directly to customers or end-users.
MarMac makes no claim regarding the hydrostatic performance of this product in field applications since the character of installation can neither be predicted nor controlled by MarMac.
Couplers should be stored carefully in their original packaging, out of direct sunlight and protected from the elements. Materials should be kept away from direct heat, sparks and open flame. For optimum results, couplers should be stored in a tepid (60°-80°F) environment prior to installation.
| MIN | MAX | |
|---|---|---|
| RUBBERIZED MASTIC | ||
| Ash-inert matter | 8% | 15% |
| Volatiles | 0.1% | 2.0% |
| Softening temp | 175°F | |
| Specific gravity | 0.95 | 1.05 |
| Penetration | 60 dmm | 90 dmm |
| Flow | 10 mm | 10 mm |
| POLYETHYLENE BACKING | ||
| Tensile strength | 4000 psi | |
| Elongation at break | 100% | |
| Tear resistance | 1500 psi | |
| Water absorption | 0.01% | |
| REINFORCING MESH ELEMENT | ||
| Tensile strength (Warp) | 75 lb/in | |
| Tensile strength (Fill) | 75 lb/in | |
| Elongation at break (Warp) | 20% | |
| Elongation at break (Fill) | 20% | |
AVAILABILITY
All sizes of gravity flow pipe
APPLICATIONS
Reinforced Concrete Pipe
HDPE Pipe
Corrugated Metal Pipe
Vitrified Clay Pipe
PVC (gravity flow)
Ductile Iron Pipe
+ More
COMMON CONNECTIONS
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 join virtually any structurally sound pipe material will another. DP Couplings are also a great choice for two pipes of the same material, but differing nominal diameter. The aforementioned diameters however, must be reasonably close to account for proper step-down/reduction.
Curious if a Dissimilar Pipe Coupler is the right choice for your job? Contact us today and tell us about your installation scenario using the form below!
RCP / HDPE
CMP / HDPE
RCP / CMP
Ductile Iron / HDPE
