Furnish and install on the plans and described herein, a Caleffi DISCAL® Air Separator as manufactured by Caleffi. Each separator must be designed with a brass valve body and seals in peroxide-cured EPDM. The separator design must include a removable internal glass-reinforced nylon fiber mesh - PA66G30, coalescing medium (304 stainless steel for compact version), to automatically remove all air present in the system. Each separator shall be Caleffi model 551 or approved equal.