We illustrate herewith an improved hose coupling, so con· nected with the hose ends as to be drawn tighter as the pres· sure to which it is subjected augments. The interior sleeve, A, Fig. 1 , is made with a slight taper, and the hose end is secured upon it by a diagonally split and tapering band, B, having a screw thread on its exterior, and also on outer sleeve, C, threaded inside as shown. The screwing up of this sleeve closes the split in the band, B, and compresses the same tightly over

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... hose. The opening in the band, it will thus be seen, allows the latter to accommodate itself to different thicknesses of hose. The female coupling, D, turns loosely on the inner sleeve, being connected by a short intermediate collar, E, Fig. 2, that is screwed by an inner thread on the threaded end of the inside sleeve, so as to retain coupling, D, on the circumferential shoulder of the same. The female coupling, D, has a recess, F, which acts as a guide to steady it in making the connection with the threaded part, G, of the male coupling. The outer sleeves are applied by a suitable wrench that enters recesses in them. The device is strong and durable, and excellently well suited to ,the uses of fire departments. It has also, we are in· formed, been successful under severe tests.