Replacement Above Ground Pool Skimmer Plugs to Temporarily Block the 38mm Outlet. Note: This product page is only for the 38mm size. If you need other sizes/colors, please refer to the Questions & Answers section. Description: Winter Pipe Protection: This pool plug creates a watertight seal on the return and skimmer lines, effectively blocking water from entering and freezing, preventing cracking and bursting during the cold off-season. All-Weather Construction: Built to last through harsh winters, this pool return line plug features a high-stretch expander for a superior seal, a durable rubber body, and heavy-duty stainless steel hardware. Easy and Secure Installation: No tools required. Simply insert the plug into the pipe opening and hand-tighten the easy-grip wing nut. The pool winterizing plug locks firmly into place, providing a reliable, watertight fit that stays in place all winter long. Versatile Utility: More than just a winterizing tool, this above-ground pool skimmer plug is essential for general pool maintenance. It stops water flow during equipment repairs, tests plumbing pressure, or temporarily blocks outlets and skimmers. Multifunctional for Home and Pool Use: While ideal for in-ground and above-ground pools, this pool plug is also suitable for various household drains, such as kitchen sinks, bathtubs, or laundry room drains, wherever you need a reliable, watertight seal. Specification: Material: Stainless steel and rubber. Size Chart: 3.8cm x 3.8cm x 4cm / 1.50in x 1.50in x 1.57in. Package Includes: 2 Pool Plugs. Note: Please allow for slight errors due to manual measurement and different monitors.