The MG Coupling is a heavy-duty, cast iron, no-hub coupling that is used primarily for commercial, industrial, and municipality applications. Although we are mostly used for underground installations, the MG Coupling is also used above ground as well.
The MG Coupling is made out of:
No, the MG Coupling is only used for cast iron soil pipe. This includes sanitary soil systems, storm water drainage pipes, and vent piping. The MG Coupling can be installed in any application that uses cast iron pipe.
Installing the MG Coupling is a simple 4 step process:
At MG Coupling, we work diligently to make sure that you are receiving the best price possible. Because the coupling is a standard item, we competitively price the coupling against other heavy-duty couplings on the market today, including stainless steel bands. We work to guarantee you the lowest price!
Very easy! From 1.5" to 4" our couplings only have two stainless steel bolts to tighten to 175 in-lbs of torque. While our 5"-10" couplings have a total of 4 bolts to tighten. You will find our couplings to be the easiest and fastest to install than any other no-hub coupling on the market. We will give you free MG torque wrenches that are pre-set to torque to 175 in-lbs. This saves you time and money on the job!
The major soil conditions which affect corrosion and must be considered are type, drainage, resistivity, acidity, and particle size. Also, the ditch back environment is a man-made disturbance of the natural environment, and can adversely affect these soil conditions.
Stainless steel is susceptible to crevice corrosion, or "concentration cell" corrosion, depending upon the shape into which it is fabricated and the degree of crevices or inside corners formed during its fabrication. Even though S.S. is resistant to corrosion due to an oxide coating, this coating can be damaged during the fabrication process. If so, the exposed area is vulnerable to corrosive attack that can affect the whole coupling.
The actual design of the MG Coupling resists the effects of soil corrosion because of the unique combination of cast iron clamps and stainless steel bolts. This combination of metals creates what is called a Galvanic Cell. This cell reverses the current flow between the two metals and provides full cathodic protection to the bolts and nuts, which hold the joint together.
When two dissimilar metals are in electrical contact with each other and are exposed to a common electrolyte (soil), a cell is formed in which galvanic (differential aeration) corrosion occurs at the anode metal (-), while the cathode metal (+) is protected. The MG Coupling forms such a cell, and tests show that the stainless steel bolts and nuts are receiving a full level of cathodic protection from the cast iron clamps (the coupling body). Since the S.S. nuts and bolts are lower in the galvanic series (below) than cast iron, they are cathodic to the coupling body, which become anodic and protect the bolts and nuts from corrosion. Now, because the coupling body and nuts and bolts are relatively close in the galvanic series, and the coupling body is much larger than the bolts and nuts, the current between the two metals is small, causing no damage to the coupling body, which is anodic.
Yes, the MG Coupling is independently tested every few years to make sure our couplings meet our standards of exceptional quality and durability. As such we conduct the following tests: Hydrostatic, Deflection, Shear, Thrust, Vacuum Infiltration, Infiltration, and Impact tests. The MG Coupling also has the highest deflection rating on the market today.
You can visit our downloads page here, where you can view many different documents regarding the MG Couplings specifications, certifications, and more detailed installation instructions.