I ordered 2 1/4 inch NPT brass plugs online, none of the local hardware stores had them. Now I need to buy a tap. All of the ones I'm finding online are 1/4-18 taper pipe taps. Is this what I need? Here's a link to what I'm looking at: Taps, Punches & Dies | Taps-Taper Pipe | 1/4"-18 NPT, HCS Taper Pipe -Carded | B223624 - GlobalIndustrial.com