the 51-HD replacement head is designed to fit the standard Series 51 valve body

resisting high differential pressures while maintaining 0% leakage

This part is a direct replacement for the 700215-16 and the GE 5KCP29BK6777S

accommodating steam and hot water applications where standard valves might fail

This valve is designed for use in systems burning either gas type

Reznor 64676 Orifice 318518-761 the 51-HD replacement head isThe Reznor 64676 Orifice is a critical 1. 30 mm brass component engineered for high performance propane (LP) burner applications. As an authentic Reznor OEM replacement part, this orifice is designed specifically for commercial and industrial gas fired unit heaters. In the field, achieving precise fuel atomization is essential for stable combustion and maximizing heat exchanger longevity. This precision machined LP burner orifice ensures the correct