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MET FAN A ‘POTTY MOUTH’

A hapless Mets fan tried to make a diving catch when her gold tooth fell into a Citi Field toilet — and got her arm stuck in the commode.

The unidentified woman’s bizarre Flushing adventure happened during last Wednesday’s game against the Atlanta Braves, sources said yesterday.

It’s unclear how long she was trapped screaming in the john, but stadium security guards and emergency medical personnel eventually showed up.

But they could not pry her loose on their own.

They called for back-up — dialing up a worker from Cardoza Plumbing, the company that installed all 646 ultra-low-flow toilets at Citi Field.

He rushed to the scene from his company’s Jamaica headquarters 7.2 miles away, the sources said.

The anxious victim, meanwhile, could only wait as the toilet continued to flush over her arm.

At one point, she became more entertaining than the game — which the Mets lost 8-7 — as fans gathered outside the bathroom near Section 338 to see the off-field action.

It’s unclear if the toilet had to be destroyed to free her.

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The woman did not recover her tooth, but was plenty relieved just to leave the bathroom.

The Mets and Cardoza Plumbing declined to comment.

Some low-flow toilets use powerful vacuum suction to minimize the amount of water needed, but it’s unlikely that contributed to the woman’s hand being stuck, a Queens plumber said.

“The truth is, this kind of thing happens all the time — usually with wedding rings or cellphones,” he said.

“People have probably been getting their hands stuck in toilets as long as there have been toilets.”

In 2003, 41-year-old Edwin Gallart dropped his phone in the toilet on a rush-hour Metro-North train, and went in after it.

Railroad employees could not pry his arm loose, and it took an army of emergency personnel 90 minutes, using Jaws of Life rescue equipment, to free Gallart and his phone.

During the rescue, the track was shut down, passengers were evacuated, and dozens of other trains were delayed.

Last year, a woman in China spent two days with her hand stuck down a toilet when she tried to save a pet turtle that she had accidentally flushed.

murray.weiss@nypost.com