Replacement Tap Mixer - Space Saving Camper Van/Truck RV SinkIn Stock Shipping Cost: $20 in Canada and to the lower 48 states. Did the early winter freeze beat you to winterizing your camper? If so, your sink tap mixer valve may have taken the hit. No problem, here is a replacement mixer unit. If the winter freeze was truly brutal and you need a complete plumbing replacement kit, that is also available here. If you just need a new faucet head it's available here.