How to bend ABS Plastic...

 Seal the ends, then heat it and bend it. As you heat it the air inside builds up pressure that holds it from collapsing.

Thanks very much for the replies!  Terry

One of the prime advantages of using ABS pipes is the plastics’ ability to reform its shape. These plastic pressure pipes are commonly  used for both underground and above ground conveyance of waste  water, drinking water, food stuff, gases, slurries and compressed air. ABS pipes  can be bent within a longer radius to suit household needs. Follow these steps  to bend an ABS pipe yourself instead of hiring a professional to do the job for  you, thus saving excess costs.

Step 1- Take Measurements

Take measurements to estimate the angle you might want the pipe to bend to.  Plastic pipes are able to deform without breaking due to their ability to absorb  stress. However, their ability to absorb stress is dependent on the force  applied, which means that pipes can’t bend beyond a certain angle. Therefore,  for more angular bends larger pipes should be used where as smaller pipes  suffice smaller bends.

Step 2- Choose a Suitable Plywood Jig

After determining the approximate angle you want to bend your pipe to, choose  plywood jigs easily available in the market with that angle. Plywood jigs  provide the same angle you want your pipe to bend to and can be used as a  benchmark to ensure you do not exceed that extent during bending.

Step 3- Fill the Pipe with Sand

Use an appropriate filling medium that suits your need to fill in the pipe,  such as sand, that ensures an even distribution of heat and provides the pipe  with an internal medium that prevents it from collapsing when bent. Enclose the  pipe from both ends to prevent air pockets that prevent or hinder an even  distribution of heat during the heating stage.

Step 4- Apply Heat and Bend Simultaneously

Heating the pipe can be tricky because plastic can easily melt if even  slightly over-heated and ABS has a melting point around 175 F, which is easily  reachable. Therefore, only appropriate amount of heat should be provided evenly  to the entire pipe. For heating purpose you can use a hairdryer or a flameless  hot gas torch. Heat the pipe evenly while simultaneously applying gentle  pressure to bend it. The best way to recognize the maximum temperature your pipe  can sustain is to use a spare small piece of pipe as sample and heat it while  adjusting the heat-knob on hair dryer or flame torch. This will give you an idea  of how long it takes the pipe to soften and the appropriate knob position to  stick to. Use the help of the plywood jig while bending to ensure that you do  not exceed the angle that you intend to reach. Make sure that you apply pressure  at the right places so that the bend is produced at the point where you intend  it to.

Step 5- Remove Sand and Rinse

Adjust the pipe into the fitting to determine whether you have reached the  right angle. Repeat the process of heating the pipe if adjustments in the bend  are required. Try to bend the pipe with minimum heating as re-heating the pipe  again and again distort its shape and leave it brittle. Open the pipe and let  the sand flush out once you reach the required angle. Rinse the pipe with warm  water to remove any traces of sand so it is clean.

Check this method out used fro bending PVC pipe.

Got to bend a lot of pipe to justify this rig but it looks like it really simplifies the job.

Charlie, You can contact most any electrical contractor. PVC pipe benders are a trade item.   There is an add on kit used to plug the ends of a piece.  Allows for a nice continuous bend without kinks.