Resources

Oswald Supply sells boiler manhole cover plates, rings, gaskets and hardware for ALL makes and models. 

For the past 90 years, Oswald Supply has been a leader in the industry, distributing manhole cover plates nationwide. Our manhole cover plates are made of pressed steel SA516-70. Low pressure and high pressure applications. 

Gaining efficiency doesn’t always mean you have to change your boiler and system. Sometimes a simple cleaning will with the right parts will get the job done and save you money.