Our 25Z has a round tube, but the outer end has a box that will take the end fitting. So the hose and camper end store there. We use the Valtera fitting that screws into the hose for the sewer end and just remove it when we pack up. I keep the loose fittings in a plastic box with lid. On our previous camper, we had to remove both end fittings to store the hoses.
Our problem with the 25Z is it's low height. The drain goes straight down instead of turning out vertically. Sometimes difficult to have the hose bend to fit on the expandable ramp and at times, the sewer fitting winds up being uphill from the drain. On the other hand, the lower height makes for lower wind resistance and the TT tows exceptionally well. No sway at all even when the big trucks pass us.
John & Nancy
Jay Feather 25Z 2007
Ford F-150 XLT 5.4 Triton 2008