3/8" (9.52mm) female national pipe thread (F-NPT) x 1/4" (6.35mm) female NPT output spray gun with forged brass housing. Industry standard and well suited for all pressure washing applications. Designed to be universally comfortable for even small hands. Specially designed heat and chemical resistant seals allow for optimum performance even in the harshest of environments. 300° F (149° C). 4,000 PSI.