hose enters the valve from the 34 j 34 shaped tube section 42b fig2 the additional section 57 of pneumatic hose exits the opposite side of the pneumatic valve 64 extending into the 34 j 34 shaped tube section 42a the pneumatic valve is actuated by a button 66 extending from the top thereof the button 66 is spring loaded to a position blocking flow of air through the valve it may be seen in fig3 a 3c that the 34 l 34 shaped bottom cover 49 is secured to the buckle assembly 46 by means of screws 67 engaging holes threaded in the safety stud mounting plate and a screw 68 engaging a threaded hole formed in the bottom of the valve mounting plate 63 it may also be seen by reference to the fig3 a 3c that positioning the tongue 51 into the buckling assembly 46 in accordance with the direction of the arrow 69 as shown in fig3 a that the tongue passes over the top of safety stud 53 and underneath the angled top cover 47 on the buckle assembly when the tongue 51 is inserted the full distance into the buckle assembly the tongue is depressed as shown by the arrow 71 in fig3 b so that it falls below the lip 62 on the safety stud subsequently the tongue 51 is moved in the direction of the arrow 72 seen in fig3 c to place the edge of the hole 52 in a position underlying the lip 62 on the safety stud consequently the tongue is inserted arrow 69 engaged arrow 71 and locked arrow 72 by the serial steps depicted in fig3 a 3b and 3c it should be noted that the inertia reel 31 and belt assembly 29 may be obtained from.