up to what size pipe will this machine groove

It can groove from 1.25" to 6" pipe sch 40 it takes a little bit of time to groove 6" 40 but can get the job done

Does it come with adapters to do copper?

No, it does not. You can add Ridgid #38233 2"-8" Roll Set Kit for Copper Tube to this. If your looking for one for copper you want Ridgid #32828. Thanks, BW

would this work with a rothenberger supertronic 4s?

Not sure, i used it on a 535 which it doesnt line up quite right for. So we made new support pipes for it so that it would line up correctly with the chuck. It worked well, generates a lot of heat. we grooved a complete air system using this and it still is in good shape .

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RIDGID 25638 Model 975 2-in-1 Portable Combo Roll Grooving Machine, 1/2" to 6" Pipe Capacity, Manual Use or Power Drive Mount, Small

RIDGID 25638 Model 975 2-in-1 Portable Combo Roll Grooving Machine, 1/2" to 6" Pipe Capacity, Manual Use or Power Drive Mount, Small

Product ID: 16667902

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💪55% higher gear reduction for effortless overhead use

📏Permanent depth setting gauge for precision

⚙️2-in-1 manual & power drive versatility

Description

⚙️ Groove smarter, not harder — the pro’s choice for precision and power!

DUAL MODE MASTERY - Switch seamlessly between manual grooving and RIDGID 300 Power Drive for ultimate jobsite flexibility.
BUILT TO ENDURE GO - Rugged ductile iron frame and ergonomic handle combine durability with portability, ready to tackle any jobsite challenge.
PRECISION EVERY TIME - Patented auto tracking technology ensures the pipe stays perfectly engaged, delivering flawless grooves with zero guesswork.
SPEED MEETS CONSISTENCY - Permanently set depth gauge lets you lock in groove depth for faster, repeatable setups—no recalibration needed.
EFFORTLESS OVERHEAD OPERATION - 55% higher gear reduction means less hand fatigue, making tough overhead grooving jobs feel like a breeze.

The RIDGID 25638 Model 975 is a compact, durable 2-in-1 roll grooving machine designed for 1/2" to 6" pipes. It offers manual or power-driven operation with patented auto tracking for precise grooves, a permanent depth gauge for quick setups, and a 55% higher gear reduction for easier overhead use. Built with tough ductile iron and backed by a lifetime warranty, it’s engineered for professionals demanding reliability and efficiency on every job.

Specifications

Manufacturer	Ridgid Tool Company
Part Number	25638
Item Weight	34.9 pounds
Item model number	25638
Is Discontinued By Manufacturer	No
Size	Small
Color	Chrome
Style	Groover
Material	steel
Power Source	ac
Item Package Quantity	1
Number of Handles	1
Included Components	Unit^Instruction Guide
Batteries Included?	No
Batteries Required?	No
Warranty Description	Ridgid covers its products with a lifetime warranty against defects in material or workmanship for the life of the tool