Some folks choose to install an inlet control/relief valve on their tanker's direct fill line in lieu of the traditional valve from the apparatus manufacturer. Most commonly, this decision is based on the relief feature of the installed valve and the ability to control the pressure entering the tank at the point of entry. During our rural water supply seminar in Johnson County, Iowa last year we saw such a valve installed on Jefferson-Monroe FD Tanker 143. The TFT ball valve with relief outfits the tanker's lone direct fill line. The valve's slow opening and closing feature coupled with the relief valve feature provides ample protection for the water tank. Of course, the important part of this installation is to ensure that the relief valve setting is set not to exceed the design pressure of the water tank.