This unit is a direct functional replacement for Watts R35-02BG and Watts R364-02BG

If it is brittle or cracked

A degraded gasket in this high-stress zone often leads to flue gas leakage or vacuum loss

The Trane SHE5389 Sheave is a high-performance adjustable pitch pulley designed for precise belt drive management in commercial and industrial HVAC equipment

Reznor 196687 Restrictor 320788-702 This unit is a directThe Reznor 196687 Restrictor is a precision engineered combustion air component designed specifically for high efficiency Reznor unit heaters. This specialized HS38 51 restrictor plate is critical for maintaining the correct orifice pressure and air to fuel ratio within the burner assembly. As a vital part of the venting system, it ensures stable flame characteristics and prevents nuisance pressure switch trips during the ignition sequence. This OEM