*PLUMBERSSTOCK EXPERT* responded:
Thank you for your interest in the Ridgid 34497! This Model 601 Support Arm is designed only as a replacement part for the Model 600 Power Drive Unit. Please refer to the Parts List if you have more questions. For the Model 700 Power Drive Unit, that is the Ridgid 42625 Model 775. Always remember to click Add to Cart to confirm your order, enter your zipcode and you’ll be all set!