4" Support clamp (Qty 1 = 5 sets) The SC4 support clamp is an easy to install professional looking component helping provide support and stability to tankless water heater venting systems. Support Clamp: Add valuable support and enhance the sturdiness of your N-Vent ventilation system with stainless steel support straps that span from your wall to your piping. Features: Stainless steel Easy installation Professional Appearance Flexibility based on wall thickness Introducing the latest advancements in tankless water heater technology for your home, Noritz tankless hot water heaters are both eco-friendly and energy efficient, providing savings up to 40% in utility costs. Their gas water heaters warm water on demand, which means you"ll always have hot water and it will never run out.