“Briana’s Bill,” a seemingly innocuous piece of legislation that was to give fathers an equal opportunity to do a little dirty work, is causing a firestorm between police union members who have lost wages the past few years, and the Miami commissioner who simply wants to be able to change his daughter’s diaper in public restrooms.

The fight is over a proposal by Miami Commissioner Frank Carollo to add about 165 diaper-changing stations to city-owned facilities. Carollo often brings his 1-year-old daughter Briana to the commission chamber or city events.

After a couple of months of back-and-forth over projected costs, the administration said this week it could get the job done citywide for about $45,000.

Commissioners are set to vote on the item Thursday. But that was before the city’s Fraternal Order of Police local chapter weighed in.

The union, which has seen members face pay and benefit cuts for three consecutive years and fears another round this year, bashed Carollo for his willingness to spend city bond money on diaper-changing tables “until more important concerns are addressed first.”

FOP Vice President Javier Ortiz’s two-page email to city brass and local media listed a hodge-podge of items police need to replace or buy, including computers, an aging fleet of prisoner transport vehicles, a roof at police headquarters, and a heavy-duty truck to pull anti-explosives equipment.

“I am clearly aware that Homeland Defense bonds can be used for improvements throughout the city,” wrote Ortiz. “But, when the city is facing a $35 million deficit, any money [including bond dollars] must be used efficiently.”

The diaper-changing faceoff in Miami has resurrected images of an old chapter in Miami-Dade politics, which ultimately brought about change.

In 1998, then-County Mayor Alex Penelas, the father of two young sons, gathered onlookers at an Aventura bookstore to raise awareness of the inequity fathers faced when changing dirty diapers.

“I don’t know how many parents have suffered some of the indignities I have, crouching on a wet and dirty bathroom floor to change a diaper,” Penelas told the crowd. Soon after the Miami-Dade County code was changed, and all new or retrofitted county buildings had to include diaper-changing tables in men’s rooms or common areas.

Penelas, reached Tuesday, said he’s all aboard Carollo’s fight, especially as the former county mayor tows around his newest child, 3-month-old Alexandra.

“Of course it’s a good cause,” Penelas said. “It’s pro-family, it’s pro-children, it’s pro-father. [Carollo] is absolutely doing the right thing.”

Carollo fired back at the FOP.

“I don’t want to dignify [Ortiz’s] outburst. I’ve established myself as a fiscal conservative,” said Carollo, who has returned almost $200,000 in unused money from his office budget to city coffers. “I have a long history of finding savings. I’ll move forward, and we’ll discuss it on Thursday.”