A mixer (46) for a plural component sprayer is configured to receive first and second component materials and emit a spray of a resulting plural component material. The mixer includes a contoured seal head (120) that is configured to interface with a contoured chamber within a receiver to form a fluid-tight seal therebetween. The mixer receives individual component materials through inlet bores (50a, 50b) formed through the mixer. The component materials mix within a mix bore (52) of the mixer to form a plural component material that is emitted as a spray from an orifice (54) formed in the mixer.