Safety Vent Safety Vent (Lubriguard) fittings have slotted threads

MB Part #	Description	Angle	Height	Shank	Hex	Alemite #	Lincoln #
MB1909	1/4-28" No Ball	Str.	35/64"	13/64"	5/16"	1909
MB1909-B	1/4-28" W/Ball	Str.	35/64"	13/64"	5/16"
MB1930	1/8" Npt	Str.	21/32"	9/32"	7/16"		5099
MB1925	1/8" Npt	65°	7/8"	17/64"	7/16"		5399
MB54278	1/8" Fem. x 1/8" Male NPTF Bushing					54278
MB54279	1/8" Fem. x 1/4" Male NPTF Bushing					54279