It is called an inverted flare fitting and doesn't use Teflon tape. Telfon tape is for pipe fittings which are tapered and count on the threads for sealing. The inverted flare fitting is metal to metal male and female flares that seat by the threaded nut holding them in compression. The threads are not meant to do any sealing, just hold the flares tightly together. If you need sealant of any kind there's a problem with your flare fitting. You have damaged flares or they are not adaquately torqued or misaligned. Look closely at the flares to see if they are scratched or cracked a nd check the alignment. The Holley chrome dual inlets are terrible for quality and alignment, it's pretty common to have problems or see where guys have used Teflon tape to try to make them seal, you're not alone on this problem. You're farther ahead to buy the inverted flare tee blocks and make your own double flared lines. Or buy the factory setup for the Holley using the brass t-block and lines. Hope this helps.