A Proportioning valve is recommended on 4 wheel disc brake applictions without ABS. This valve allows you to adjust the increase rate of the line pressure to the rear wheels for optimum overall braking performance with a trun of the knob. Featuring removable brass seats that when installed create a 3/16" inverted flare seat or when removed can accept banjo or straight 3/8-24 fittings. The valve includes 2) brass seats and 2) 3/8” x 24 tube nuts.