Rudy wrote:

The tool is for the steel crimp rings, about $90.

Here, The Home Depot rents the tool by the day for 10 bucks

I rented one and it cost about 10 for 1/2 day. If you plumb with the
stuff, you want to buy the tool, unless you are really fast and never
have any maintenance problems. Most tools where I live rent for a
price that is about 1/4 to 1/6 per day of the cost of buying.
Anything that spills over a week means you should buy the tool,
probably can sell it for 1/2 of the buying cost, so much cheaper than
renting.