Hayward Perflex EC30 Flex Tube Nest (ECX1133) circuitboardparts and general maintenance tasks where and general maintenance tasks where a flexible silicone material is appropriate Raypak 207A Refractory Retainer Kit is a Raypak heater refractory retainer kit used to help secure and support refractory material within the combustion area The Hayward Perflex flex tube nest is designed for compatible EC30 DE filter applications where the internal tube nest assembly needs replacement The ECX1133 is a practical service part when a compatible Hayward Perflex EC30 filter needs a tube nest to restore dependable filtration performance