Coming up underneath the spa in the 400 series you better be dead on, not much of room in there. If you know where the spa will sit you can measure and place the conduit to either the left or right of the control panel side of the spa, there is a 1"1/4 whole in each corner of the front of the spa,about 4" off the ground and 3" or so back from the corner of the ABS pan.