I buy Gilmour, they have a wide mouth for filling and also makes adding a tire valve much easier. I also replace the hose with PVC air hose,...I buy a 6' whip line at a local "everything" store,..I cut in in half and have two 3' sections,...each with a 1/4" brass male end. I then add a female pressure washer coupler to the hose,..and fit the wand with the male end,.....then when I'm done with the sprayer I just easily remove the wand and rinse clean water through it. I buy wands from dultmeir,..that have a 1/2" male inlet that can be adapted down to 1/4" with a simple fitting. Also makes replacing the wand easy
*These sprayers last 2-3 seasons,..depending on whats used in them. Usually what gets them is us adding 60-70 PSI,..eventually the seem gives up and starts to seep.
**We use a trigger type inflation tool with a built in gauge.
***Wands don't have to have a regular trigger,...I also, have a homemade wand that I use for stronger acids like Hydrochloric or Hydroflouric. PVC ball valve and plastic extension. Designed ergonomically so I can easily turn the valve with one hand. Just needs cracked open to work,..never needed fully open.
Jeff