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The contractor-grade Watts 007 Series double-check valve assembly began production in 1989 and is still being manufactured today, with slight modifications along the way. These are denoted by the letter “M” in the part number, such as Watts RK 007M2, denoting the second modification. Though the 007 series of valves may appear identical on casual observation, the parts inside the valves may be significantly different. It's therefore important when ordering your 887721 rubber parts kit or your RT 7016352 rebuild kit to match the correct modification number.
The Watts complete rubber parts replacement kit found here is designed for second modification 007 series double-check backflow preventing valves. This factory replacement kit contains two seats and seat O-rings and cover O-ring.
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