just in case you don't know....... you have to have a business account with them (easy to set up) and they will deliver to your front door..............
When they are aligned perfectly they will last for years. We had one last four years, after chewing up two in a few hours. Two pieces of 1" angle iron about 6-8" long will make it easy. Lay the angles over BOTH cups and feel for misalignment in height or angle. Many "factory" couplers are only crudely lined up.
That was the companies name I bought mine from in Spokane. Motion... Great price always had them, and after a while they did not even need to ask what I wanted when I walked though the door, in fact I think they held a few behind the counter for me all the time.
What happened was my front van door closed on the motor cutting the air off and blocking the exhaust....The engine choked down (200 ft. of vac hose on) and with the jerking from the bogging broke the coupler.
I have one on but need a spare. BTW, there are 3 models of the same size..one piece solid..one piece cut ..and 2 piece.....thanks to all who answered...Richard R
BTW, I will be using a bungee cord on the door from now on....