Mar Mac’s Poly Seal HDPE couplers are the industry standard external joint couplers designed to join corrugated HDPE pipe or HDPP pipe.  Poly Seal couplers permanently restrain seal and secure any connections made between two pieces of plastic polymer pipe.  Mar Mac couplers seal Bell and Spigot connections as well as “cut and butted” sections of plastic pipe, making them vital in virtually any installation of corrugated plastic pipe.  Our couplers are relied upon by hundreds of contractors, farmers, engineers, municipalities and even pipe manufacturers. With hundreds of thousands of our PolySeal Couplers operating as expected throughout North America, Poly-Seal continues to prove itself as the easiest, quickest, and most cost-effective solution for sealing corrugated plastic pipe permanently and effectively.

Poly Seal couplers are an external joint wrap for HDPE pipe which utilizes specialized mastic reinforced internally with a layer of woven polypropylene. Our joint seals wrap the entire outer circumference of the pipe and are secured mechanically with three integrated compression bands. The combination of our mastic’s adherence, the puncture and shear resistant reinforcement and our unique use of internalized securing bands results in an almost infallible product designed for quick and easy installation even under less than optimal field conditions.

What are PolySeal Couplers for HDPE PIPE Used For?

If the only type of plastic pipe you are familiar with is PVC, it might be beneficial to familiarize yourself with the basic differences between polyvinyl chloride (PVC) and high-density polyethylene (HDPE). lists the following as some of those differences:

  • Polyvinyl chloride is the third most widely used plastic while polyethylene of which HDPE is a type is the most widely used plastic.
  • PVC is amorphous while HDPE is semi-crystalline.
  • Both are strong and durable, but their strengths vary, and they have different applications. PVC is heavier and stronger while HDPE is harder and more abrasion and heat resistant.
  • HDPE pipes are found to be able to dampen and absorb shock waves minimizing surges that can affect the system while PVC cannot.

If keeping the size and cost of the pipe as small as possible are your main concerns, PVC pipe will do. But HDPE is the better choice when performance and endurance are the key factors.

That HDPE pipe becomes even more durable when coupled with something like a PolySeal Coupler.

HDPE Pipe for Contractors

Since the class action suit against IPEX: a premier pipe manufacturer, contractors should be showing an even greater concern for the quality of fittings they use as a part of their piping solutions. The CBC reported:

The Canadian statement of claim alleged the fittings were faulty causing pipes to disintegrate. Plumbers say the brass reacted with the chemical composition of the pipe, causing it to corrode, or "dezincify," and fail.

Better fittings might have made all the difference in cases like homeowner Frank Cappellino of LaSalle, Ont. He found his basement completely flooded as a result of pipes damaged by bad fittings.

As with the human leg, it is not the femur or tibia you have to worry about, it is the knee joint. Contractors take note, it does no good to use the best pipes with the worst fittings. Both have to be at the top of their class.

HDPE Pipe for Farmers

For any number of practical reasons, farmers need pipe, and lots of it. Their choice of pipe and fittings can weigh heavily on their bottom line.

One consideration might be the expense of burying pipe as opposed to leaving it above ground. Some other considerations include:

* Protection from breakage - PVC is thinner and more brittle
* Protection from UV light - PVC will have to be painted
* Freezing Prevention - PVC suffers from freezing

HDPE pipe with PolySeal couplers have fewer downsides to being left on the surface. They are far more durable. They can be scratched to a depth of 10% of their surface without losing their pressure rating.

When it comes to freezing, HDPE pipe has a crystalline temperature of - 180 degrees F as opposed to 32 degrees F of PVC. That means that water can go through many refreezing cycles inside of HDPE pipe without permanent damage. The same cannot be said for PVC.

The PolySeal Coupler is what makes HDPE pipe so useful in so many situations. It maintains the integrity of the pipe, ensuring performance over the long haul minus all the repair and replacement costs of the alternative. When it is time to replace your old PVC pipes, be sure to do so with the more reliable HDPE.

When it is time to replace your old PVC pipes, be sure to do so with the more reliable HDPE.


For more information or technical queries on our PolySeal external joint seals for HDPE and HDPP pipe, please use our digital contact form or call us today at 843-335-5814.