Product Description This deep wall extension kit is compatible with D5609 series trim kits used in conjunction with Gerber D135300BT 3/4” volume control valves. Designed to accommodate an additional 13/16” of finished wall depth, the kit includes a long attachment screw, a long stem extension, and a long shank. This extension kit is for use when the distance between the back wall of the valve body and the front of the finished wall is greater than 4 1/4". From the Manufacturer For nearly 20 years, the kitchen and bath industry has known Danze as a leader in product design and beautiful styling. What industry professionals and homeowners may not have known is that Danze has a sister company, Gerber – an 85-year-old manufacturer of some of the highest performing, most reliable products on the market. To best meet the diverse and ever-changing needs of home products, Danze has transformed to be Danze by Gerber, a perfect blend of the handcrafted, trusted performance of Gerber on the inside and beautiful design on the outside. The Danze by Gerber product combination can be found in a range of kitchen and bath faucets, bath accessories and shower systems. A thoughtful balance of form and function. Inspired, beautiful design on the outside. Handcrafted, trusted performance on the inside. A combination that results in true value and commitment. You can call it a breath of fresh air. We call it Danze by Gerber.