OTC (2423 Stainless Steel Tip Blow Gun When inlet pressure is 90 PSI, venting design prevents pressure exceeding 30 PSI if tip becomes blocked When inlet pressure is 100 PSI, the noise level is held below 80 dB conforming to OSHA Standard 1910-95 b, quieter than an electric drill 4-1/4 inch stainless steel nozzle and variable speed trigger for full control of amount of air dispensed Impact and Weather resistant materials and drop resistant construction Brass threaded air inlet