" meaning the module will attempt to light the burner three times before entering a safety lockout mode if no flame is sensed

If you are servicing a valve with brass trim or a larger 3/8" stem (DN25-DN50)

The NBR (Buna-N) seals provide consistent shut-off across a wide temperature range

Do I need sealant with this gasket

Lennox 68W77 Conversion Kit 320734-701 " meaning the module willThe Lennox 68W77 natural gas to LP conversion kit is a critical OEM component designed for field converting gas fired heating systems to liquid propane operation. As a Lennox genuine replacement part, this kit ensures that manifold pressure adjustments and orifice sizing meet exact factory specifications for safe, efficient combustion. The 68W77 is engineered for high performance HVAC fuel conversion, maintaining the appliance's thermal efficiency