Part Number SI-411 having (CAGE Code 23540) and FSC 5970 Electrical Insulators and Insulating Materials in stock with ready to ship. Get an instant quote for SI-411 Insulator Plug by Niagara Plastics L L C. Fill the form below with your desired order quantity, targeted price and the expected order-fulfilment date. Our dedicated account manager will get back to you within 15 minutes.