flame-retardant plastic

Look for the plated finish

this is a #20 orifice which is common in many York residential models

As an OEM York replacement part

scale accumulation occurs rapidly

Weil McLain 592-800-007 Polmer Seal flame-retardant plasticThe Weil McLain 592 800 007 is a precision engineered 6 inch bottom elastomer seal designed to maintain the pressure vessel integrity of high output cast iron boilers. This critical HVAC replacement part is engineered specifically for sealing section joints in various Weil McLain series, including the 86, 88, 94, and EG EGH models. Unlike standard gaskets, this industrial grade elastomeric seal provides superior resistance to chemical degradation and