I have a Gilmour 3 gallon Model XP30 that I bought off Amazon in 2011, 5 years ago. Its the best sprayer I ever owned!  I bought the R58C handle kit because I lost the tip on the wand end, ordered a new copper wand, decided to go ahead and replace the valve handle. Its an exact match. It was a breeze to install. Here are a few tips:  The hardest part is the plastic sleeve that slides over the valve hose fitting. Be sure and pay close attention to which is the bigger of the holes on the sleeve;  I had to measure the holes with a tape measure just to make sure. The bigger end goes towards the valve head. I couldn't get it to slide on even with a pair of pliers. I rubbed some screw wax on the hose and it slid right on with no trouble. Vaseline would work as well. Last summer I noticed a few pin holes in the copper wand. I fixed this with some JB Weld. You can get this at any hardware or big box store. Just mix up a small dab and rub over the pin hole, let it dry 24 hours and it will be a good as new (maybe not as pretty!).  Another tip is to keep the pump assemble oiled. I failed to ever do this and last summer the O ring pulled off the pump piston. I was able to fix it after finally figuring out how to take it apart. I keep it oiled and it works better. On my sprayer there are 4 oil holes at the top of the pump. The oil helps prevent that ring from catching on the sides of the barrel and pulling off the piston. The product R58C kit works great.  Hopefully I can get 10 years out of this sprayer. Ill report back then and let you know if it made it!