That's good, however, if they are easily removed, I would do so and check to see if they have a smaller orifice at the bottom, or the top. Bottom is best.

Some of the early "tubes"(nipples) were just that and if just a straight hole inside, can be VERY hard on the hammers (cocks) and main springs due to pressure coming up the "tube".

If just straight tubes, then they should be replaced with modern ones.