Replacement Valves Cartridge Spares Franke Maris Mixer Pair Replacement valves/cartridges for Franke Maris Mixer kitchen tap. Fully compatible: SP3308 / SP3794 Buy replacement valves cartridges if your tap is leaking or dripping from the end of its spout. Buy with confidence, hundreds of 5* eBay reviews, taps fixed and happy customers. Got a dripping spout? Don't worry, we have the answer! Tap Spares UK quality ceramic disc valves are supplied as a pair. They are fully compatible with the Franke Maris Mixer kitchen tap.