Blue-Max Joint 4 1/2" x 3" x 5/8"

Even the slightest leakage is too much, as it increases maintenance and reduces boiler life. Tests by major boiler manufacturers confirm that Blue-Max gaskets seal with zero leakage in steam to 450 psi and can withstand working temperatures up to 500°F. Rubber gaskets simply can’t take that kind of pressure and heat.