My most frequently used bag is a 3-qt Klystra replica of the Davol HWB style closed top syringe with black hose and stainless steel clamp.
There are a couple of nozzles I use with that bag. One is a 3-inch white flared rigid nozzle The other Is a non-rigid flesh colored 5-inch nozzle with a triangle shaped bulb at the front and bigger holes.
Sometimes for a quickie one-bagger I go ahead and use one of my two quart bags with the straight white rigid "Drug Store" type nozzle.That one dates from the 1970s and was very likely the one my grandma purchased for my Mom right after they got to the US. It's fittings are white and the feminine nozzle is the straight thin "bat" type that was common then.
Since I DO very occasionally still douche, I have a green open-top classic bag with black fittings that I use for no other purpose than those occasional douches I now have fewer hangups about e-purposing the feminine nozzle from my HWB-style 1970s 2-qt bag to use for one of those quickie enemas. I find that, when I do that, I can feel the nozzle better, yes, but the down side is that I have to insert it, remove it, take a sewing needle and open most of the holes and re-insert it. No fun!!
Speaking of no fun, once or twice per year I will get to a clear return with the 3-qt bag and some Milk of Magnesia, and then when cleared out I will get out my big 4-qt "Great White"open top bag. It has a brown ribbed wider hose.
I fill it with VERY soapy hot water, hang it from the same hook as the 3-t Knee-chest position enemas were taken earlier in the session. I then put the 5-inch rigid "Barium-type" nozzle on it, Then I get into Simms position and try to relax a much as possible I put a LITTLE KY Jelly on the nozzle and try not to stare at the nozzle. I remember what Dad told me the first time I ever took this kind of enema. "You know where it needs to go, No sense making it harder by looking at it just get it there!"
I make sure it IS pointing at my navel and slowly push it in. I make sure I am fully relaxed, and take at least 3, often 5 or 6 deep-as-I-can breaths.