if it is the coupler i am thinking of, then the "cleaning" position on it simply opens up the output vlave to where there is no restriction. the way that coupler is built, with that three way valve on the top of it, you can shut off the beer flow, set it to run normally with restriction, or set it to clean with no restriction for higher flow rate. if you take the beer and co2 line off the coupler and look thru the top you can see that it is just a ball valve that you can create restriction with.
__________________
-jomo
|