Cramer's 'Mad Money' Recap: Just Add Watts Water

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Watts Water Technologies (WTS Quote) is the stock to buy for exposure in the water sector, Jim Cramer told viewers of his "Mad Money" TV show Thursday.

After hearing about Watts Water from a caller during Wednesday's Lightning Round and doing his homework, Cramer believes that this stock is a "serious buy."

"Watts Water has a theme, and a theme is everything," he said.

When Cramer was first starting out in this game, he learned that market players need to find themes, "things that will work for many years."

"Themes are like tides," he said. "They always come back."

One theme that Cramer has favored on his show is the obsession-with-vanity theme. Another theme he has liked is the shortage of water and the need for clean water.

However, Cramer hasn't been able to find a pure play until now with Watts Water.

Cramer said he's thrown money into water stocks Pentair (PNR Quote) and Aqua America (WTR Quote), only to be disappointed. He's also looked at water companies in Europe, "but they, too, are played out," Cramer said.

Although Cramer said he wasn't there for Watts Water from the beginning of its rise, if he's right about the water sector, Watts Water is still a buy.

"It's an expensive stock in a great growth area," he said. "It is a best-of-breed stock and is cheaper than its peers," which it shouldn't be, he added.