AIR BLOW GUN|Lincoln's #840 blow gun has a handy thumb-button design for easy operation, and a brass stem and synthetic packaging for service life. The addition of an air nipple permits quick connect or disconnect, and it can handle up to 30 psi maximum pressure. Its inlet is 1/4" NPTF, and its outlet is 7/64" diameter. Model #950 is the same, but includes an air restrictor. Both guns comply with Federal Safety Regulation 50-204.8 and OSHA 1910 242.B standards.