Johnson Controls P20DA-31 Pressure Control Els PW 17895 this brass valve body is

this brass valve body is part of the legendary PopTop™ series

In most cleanroom environments

Reliable Fail-Safe: Professional-grade spring return functionality ensures the damper returns to its normally closed position immediately upon power loss

Enhanced System Safety: Functions as a high-reliability safety limit to prevent furnace operation during restricted airflow or high-heat conditions

This radiator valve body is the standard choice for contractors looking to upgrade vintage cast iron radiators or modern hydronic loops with energy-efficient thermostatic control

Johnson Controls P20DA-31 Pressure Control Els PW 17895 this brass valve body isJohnson Controls P20DA 31 Air Conditioning Pressure Control, 100 Psi to 425 Psi, 36" Capillary P20DA 31 is identical to P20DA 31C