Proflow Water Neck, Billet Aluminium, Black Anodised, 45 Degree, Swivel, For Mazda Series 4, Billet Cap Neck

Proflow's billet thermostat housings not only look good, but they also get rid of leaky paper gaskets thanks to their O-ring seal design. You can choose the conventional vertical housing or the high-tech 360 degree swivel housing. They're available straight-up or with a 0, 45, or 90 degree angle and come complete with stainless hardware.