five days in order to develop the necessary bond strength the hose is now ready for use in connection with push on couplings of the type shown in fig2 and 5 this coupling generally designated 40 has a nipple portion 41 adapted to be pushed into an end of a section of the hose 10 the nipple has several barbs thereon the first barb 42 has a rounded rear corner 44 the remaining two barbs 45 46 have sharp rear corners 47 48 all of the barbs preferably have the same outside diameter dimensions for the barbs on couplings for hoses of given inside diameter are preferably about as follows chart 1 fitting dimensions______________________________________ a b c number barb length of barbsnominal of large second and smallhose id barbs diameter third barbs diameter______________________________________1 4 34 3 340 250 2503 8 34 3 468 335 3751 2 34 3 598 410 505______________________________________ the hose of the present invention in which one or both of the core tube and cover are of pvc should have dimensions approximately as follows chart 2 pvc hose dimensions______________________________________ minimumnominal actual core tube cover braid braidhose id id od od angle coverage______________________________________1 4 34 275 375 525 48 7 u00b0 75 3 8 34 395 495 645 47 7 u00b0 75 1 2 34 530 630 780 54 u00b0 75 ______________________________________ with hoses and couplings dimensioned as described in charts 1 and 2 above the barbs are respectively 124 119 and 113 greater in diameter than the actual inside diameter of hoses of nominal 1 4 inch 3 8 inch and 1 2 inch id and with the materials indicated the force required to push the coupling into the hose into the fully assembled condition as shown in fig2 and with no lubrication on the hose.