When diagnosing combustion issues or performing a gas valve manifold service

While the gasket itself provides the seal

this high-temperature gasket prevents combustion gas bypass and air leakage

Can I use a universal plastic blade instead

C and E Models

McDonnell & Miller 313200 Strainer Gasket When diagnosing combustion issues orFor veterans in the field, maintaining a leak proof seal on critical boiler water feeders is non negotiable. The McDonnell & Miller 313200 Strainer Gasket (Model 37 39) is a precision cut 4 hole sealing component designed specifically for McDonnell & Miller 47 Series, 53 Series, 67 Series, and 70 Series water feeders and low water cut offs. This OEM replacement part is essential when servicing the 14 B blow down valve or the integrated strainer