MTM Hydro Spray Gun With Coupler  for Spray tips and Inlet plugs. (3/8 plug and Twist Connect Male Adapter M22 x 14mm Bore size).
Applications:
Industry standard, the M407 is well-suited for a variety of industrial pressure washing applications. Pressures up to 4000 PSI up to 7 GPM   Temp. 250F Max.    3/8" Female Pipe Inlet--- 1/4" Female Pipe Outlet. Designed to be universally comfortable, even for small hands.