Johnson Controls T-4000-2141 Plastic Cover The standard replacement part is

The standard replacement part is the JB K1-E 3/4" fiber drum adapter seal

Versatile Control Logic: Dual-pole configuration (1PNO/1PNC) allows for complex switching in HVAC control circuits

On the secondary side

flare connections rely on a metal-to-metal seal

you can always go up in voltage rating (e

Johnson Controls T-4000-2141 Plastic Cover The standard replacement part isThe Johnson Controls T 4000 2141 is a commercial grade beige plastic thermostat cover designed specifically for horizontally mounted pneumatic thermostats. This impact resistant housing provides a professional finish for pneumatic control systems while protecting internal components from dust and debris. Engineered for the T 4000 series, the cover features a clean aesthetic with the Johnson Controls logo and a single set point window for clear