Assuming it is similar to my LS190B. You have a switch for high flow or normal flow up by the instrument panel that is labeled high flow. You also have a 2nd set of hydraulic attachment fittings that are different in size for a total of 4. I was told that it is very expensive and labor intensive to install a high flow system if you can even get the parts for an older model but it can be done. This is why I bought one that had it factory inatalled. I also have high flow emblem on the machine. If you don't have the high flow, normal flow is 19 gpm I believe.