Must be used with an orifice. For orifice options see:55-410-1346 - Orifice Tee, BWG/GG Micro Jet, 1/4" Orifice x 3/4"b x 3/4"b55-410-1347 - Orifice, 90deg, BWG/GG Micro Jet, 1/4" Orifice x 3/4"b55-410-1348 - Orifice, 90deg, BWG/GG Micro Jet, 1/4" Orifice x 1/2"s