Watts RK SS007M1-CK4 - Part of the RK-SS007 Series ZC100F-4NH They come with interlocking joints

They come with interlocking joints for easy connections—no couplings required

The drain cover has an open surface area of 106

heel proof ductile iron grate

SKAPS GT-116 resists ultraviolet deterioration

It consists of a diaphragm

Watts RK SS007M1-CK4 - Part of the RK-SS007 Series ZC100F-4NH They come with interlocking jointsThis 1 inch first or second check replacement kit, is for series SS007M1, which is used to prevent the backflow of contaminated water into the potable water supply. The kit consists of a seat, seat O ring, disc assembly and spring, check cage, and cover O ring. Features Factory Replacement Kit No special tools required for changing parts All parts are made of high quality materials First or Second check kit Specifications Compatible Series or Model