Complete and ready to use. No washers, rings, inserts, or sleeves needed. Special coated fibers for continuous exposure to high heat. No. BWB0-18: 3/4'' F.I.P. x 3/4'' F.I.P., 18'' long No. BWB0-24: 3/4'' F.I.P. x 3/4'' F.I.P., 24'' long No. BWB08-18: 3/4'' F.I.P. x 7/8'' O.D. comp., 18'' long No. BWB08-24: 3/4'' F.I.P. x 7/8'' O.D. comp, 24'' long No. BWB20-12: 3/4'' M.I.P. x 3/4'' F.I.P., 12'' long No. BWB20-15: 3/4'' M.I.P. x 3/4'' F.I.P., 15'' long No. BWB20-18: 3/4'' M.I.P. x 3/4'' F.I.P., 18'' long No. BWB20-24: 3/4'' M.I.P. x 3/4'' F.I.P., 24'' long No. BWB28-18: 3/4'' M.I.P. x 7/8'' O.D. comp., 18'' long No. BWB28-24: 3/4'' M.I.P. x 7/8'' O.D. comp., 24'' long