This motor is a specific OEM part for several Armstrong

Flexible Installation: Supports daisy-chain configurations

Is the A-4000-1049 compatible with older A-4000-149 installations

this OEM component is critical for boiler tank corrosion protection by diverting the chemical reactions that cause heater oxidation and premature failure

Standard 1/4" Barb: Features a universal-fit hose connection for quick replacement of original sensing lines

Trane SHE5330 Sheave 321142-301 This motor is a specificThe Trane SHE5330 Sheave is a high performance HVAC blower pulley designed for precise power transmission in commercial and industrial air handling units. Featuring a 1 inch bore and an AK69 profile, this single groove sheave is engineered for a seamless fit with 1 inch motor or blower shafts, ensuring optimal belt drive alignment and reduced vibration. Unlike generic alternatives, this pulleys and sheaves component is constructed from heavy duty cast