If the diameter of the hole is 1-1/2" or so then you take any Basic or Low Voltage Hose. We suggest the Low Voltage Hose because, though you can't use the on/off switch, it is a better hose all around, rarely kinks, and is easier to handle. If you have a diameter more like 1-1/4" then you'd use the Low Voltage Hose with this stub tub pushed into the hose wall end. Or the Basic Hose with reducer already on it http://builtinvacuum.com/retail/shopretail.php?part_no=302RC,303RC
. For those of you who want an electric kit you can buy any "corded" version of any kit and it will fit the larger diameter inlets and the smaller with this adapter.