Comparison : Item # B2716-1, Hinge Lid Cap, for Brass Gage with 5/8" dia Glass
Item # B2716-2, Vented Screw Cap, for Brass Gage with 5/8" dia Glass
Item # B2716-3, Cap with 1/4" Female NPT, for Brass Gage with 5/8" dia Glass
Item # B2716-4, Cap with 1/4" Male NPT, for Brass Gage with 5/8" dia Glass
Item # B2716-5, Cap with 1/4" OD Tube Connection, for Brass Gage with 5/8" dia Glass