Part Number 7138S having (CAGE Code 73928) and FSC 5970 Electrical Insulators and Insulating Materials in stock with ready to ship. Get an instant quote for 7138S Insulator Knob by Knox Porcelain Corp. 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.