SC4 Noritz 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.Stainless steelEasy installationProfessional AppearanceFlexibility based on wall thicknessQuantity 1 = 5 sets