This riser pipe holder is made to mount on the C and D Ring Packages. This is a very nice complement for your vintage bathroom. It holds the riser pipe coming up from the faucet tight against the shower rod. This part must be ordered if exchanging the rectangular enclosures for the C or D Ring packages - please call us for details - 877-868-1369. This part can only be used with 1'' diameter shower rod. Enjoy free shipping on all our vintage tub products.