Stainless Steel Bidirectional Baffle, NW-16 connection on one end and 1/8 inch FNPT connection on the other end. Designed for applications where dust and dirt can cause short gauge tube life. Typical applications include freeze drying, vacuum melting and steel degassing. These inexpensive baffles are easy to use. Just connect the baffle to the vacuum system and connect the gauge tube to the baffle.