T-H Marine DP-1-DP Self-Retaining Boat Transom Drain Plug - Black<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Mounts in a 1" diameter hole with two countersunk stainless steel screws </span></li><li><span class="a-list-item"> Back side of mounting flange has a groove to hold sealant for positive water proof mounting </span></li><li><span class="a-list-item"> Features an chemically inert "O" ring for positive sealing </span></li><li><span class="a-list-item"> Screw-type drain plug </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41fSxMR7n7L.jpg" noproxy>