A valve assembly is provided. The valve assembly includes a valve housing and a harbor provided at a lower portion of the valve housing. The valve housing has an internal bore for receiving a valve control cartridge, and the harbor has a first recess suitable for receiving a water supply tube, and a second recess suitable for receiving a second water tube, wherein the harbor also has a slot. The valve assembly further includes the water supply tube mounted in the first recess, the second water tube mounted in the second recess, and a retainer clip positioned in the slot with that clip simultaneously engaging both tubes. The retainer clip comprises a first leg and a second leg connected by a waist to define there between a retaining area, and at least the first leg has formed thereon a notch adjacent a heel of the leg.