2-1/2" (Round), 2-1/2" Stem Length - 0-75#

(30-50-psi; 207 kpa 345 kpa safety relief valve)

can be used on most residential boilers:

Peerless 63/64, DE, GM, MI85/MIHII/MI/MI-e, PDE, Purefire 50 - 399

ENFM 16535 (1/4" NPT.)

Burnham Part #105894-01