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19 As already stated, ”B” size hose nipples are available to fit four hose sizes (3/16, 1/4, 5/16, and 3/8-in.) and for use interchangeably in either oxygen or fuel gas service. The ”hose end” of the nipple can be formed in two ways: with two or more ”barbs”, or with a spiral ”thread”. The latter is usually called ”screw-type”, the former, ”push-type”. The ”screw-type” is literally screwed into the end of the hose after a snug-fitting brass ferrule has been placed on the hose. The ”push-type” is pushed into the end of the hose, after slipping a ferrule or a hose clamp onto the hose. Fig. 5-15 shows four ways used to make strong, leak-tight nipple-to-hose connections. The crimped-ferrule connection is universally used on pre-fitted hose assemblies (and most hose for welding and cutting is sold pre- fitted). The circle-clamp connection is normally preferred when you must make up your own connections. Never try to use ”screw-type” nipples with circle-type hose clamps. If you must use a clamp, use the ”Sherman” type. To link two pieces of hose already equipped with fittings, couplings are available. With these, you can connect 3/ 16-in. hose with ”A” size fittings to larger hose with ”B” size fittings. To repair a hose from which you have had to cut out a damaged section, use a hose splice. Couplings and splices are shown in Fig. 5-14. Fig. 5-15. Cross-section views of four methods used to fit hose with leak-tight connections. (Upper left) Screw-type nipple with heavy brass ferrule. (Upper right) Push-type nipple with screw- tightened ”Sherman” clamp. (Lower left) Push-type nipple with machine- crimped ferrule. (Lower right) Push-type nipple with circle clamp, which is tightened with special pliers.