Pool Pressure Test Plugs Anderson WDP150 Winter Duck Plugs, Plugs - Canada Pool Winterizing Plugs These versatile, straight-sided rubber test plugs can be used to block off almost any easily accessible opening. Keep in mind that most oil-based lubricants will damage the rubber of the plug, so we recommend using a silicone lubricant. Your complete resource for products from Anderson Manufacturing Co,Inc. with the lowest prices and great customer service Vizava 2 Pack Rubber Pool Winter Plugs with One T-Handle Anderson 150 1-5/8 Standard Closed Winter Plug Additionally, recommended pipe applications for each size can be seen under “Specifications” once you select a size from the drop down menu. <! Anderson Manufacturing O50 1 5/8" Standard Open Test Plug