olive puller, i think.
http://www.wonkeedonkeetools.co.uk/olive-removers/how-do-you-use-an-olive-puller
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How to use an olive puller
How to use an olive puller
Before you begin
Prior to use, ensure the pipe is clean, burr and swarf free, and not distorted.
burrs, copper pipe, plumbing, swarf
Burrs
Burrs are small chips of metal left over, typically after a piece of metal has been cut, or otherwise shaped.
Swarf iron filings metal shavings wonkee donkee tools DIY guide
Swarf
Swarf refers to any sort of excess material (such as: shavings, chippings or filings) from any metal, plastic or wood cutting process.
Swarf is a general term for such chippings and each trade may have its own specific terminology. For example, wood swarf is more commonly known as "sawdust."
olive puller, plumbing tool, copper pipe, brass, compression fitting
An olive puller can only remove 15mm (0.6") and 22mm (0.9") olives. If your olive is smaller or larger than this then you will need the corresponding olive cutters.
Olive cutters come in a range of sizes from 8mm - 28mm (0.3 - 1")
Removing 15mm olives
spindle, insert spindle into 15mm body, olive puller, copper pipe, plumbing tool
Step 1 - Insert spindle
Insert the spindle into the 15mm body. The threads of the spindle will interlock with the internal threads of the 15mm body.
olive puller, plumber tool, copper pipes, 15mm, retract the spindle
Step 2 - Retract spindle
Retract the spindle as far as it will go.
insert olive puller into 15mm copper pipe, olive puller, plumbing tool
Step 3 - Fit olive puller onto pipe
Fit the olive puller into the 15mm pipe. The 15mm pusher should fit snugly into the pipe and the pusher's shoulder will stop it going any further into the pipe.
olive puller, copper pipe, compression fitting nut, 15mm, plumbing tool
Step 4 - Screw body into compression fitting
Screw the 15mm body into the compression fitting nut.
olive puller, plumbing tool, brass, copper pipes, rotate the spindle
Step 5 - Rotate spindle
Slowly rotate the spindle using the T-bar handle. This will force the spindle down into the body and against the pusher.
As the spindle pushes against the pusher it forces the body to draw up and pull the olive from the pipe. This action is similar to how a corkscrew functions.
olive puller, plumbing tool, copper pipe, 15mm, compression fitting nut, brass
Step 6 - Unscrew nut
Unscrew the compression fitting nut and remove from 15mm body.
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Step 7 - Remove olive puller
Remove the olive puller from the 15mm copper pipe.
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Step 8 - Remove olive
The olive will be contained within the 15mm body.
Congratulations! You have successfully removed your olive!
Removing 22mm olives
olive puller 22mm, plumbing tool, copper pipes, compression fitting, brass
Step 1 - Select right sized adaptor
To remove 22mm olives, you will need to use the 22mm pusher adaptor.
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Step 2 - Place pusher into pipe
Place the 22mm pusher into the end of the copper pipe. The pusher's shoulder will stop it going too far into the pipe.
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Step 3 - Attach body
Attach the 22mm body to the 15mm body and spindle.
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Step 4 - Fit body onto pipe
Fit the 22mm body over the pusher and onto the 22mm pipe.
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Step 5 - Screw on nut
Screw the compression fitting nut onto the 22mm body.
olive puller, 22mm, compression fitting nut, brass tool, plumbing tool
Step 6 - Rotate spindle
Slowly rotate the spindle using the T-bar handle. This will drive the spindle into the pusher and force the 22mm body up and pull the olive from the pipe.
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Step 7 - Unscrew nut
Unscrew the compression fitting nut from the 22mm body.
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Step 8 - Remove olive
The olive will be contained within the 22mm body.
Congratulations! You have successfully removed your olive!
an "OLIVE" is what i call a compression ring.
i have never seen this tool before, I've used a crescent wrench to coax/pull them off for years
what are you going to do with it ?