also identified as the XB-1019MC1B

and AMH8 series

Viton seals (suffix V) offer better resistance to chemicals and higher temperatures than standard NBR

ensuring safe burner startup sequences in residential and commercial heating applications

What should I do if the pilot won't stay lit

Armstrong International C3510-3 Vent THPU32HP7Y also identified as the XB-1019MC1BThe Armstrong International C3510 3, also identified as the Model 11AV 3 4 178, is a high performance stainless steel air and gas vent designed for reliable fluid management in demanding HVACR and industrial environments. Featuring a 3 4" NPT inlet and a 1 2" NPT outlet, this free floating lever vent provides positive venting of air and non condensable gases under pressure. Its all stainless steel construction ensures superior corrosion resistance,