This kit provides replacement parts of the Chapin slide sprayer most likely to fail or leak while the sprayer is operating with spray solution leaking all over your hands and arms making a big mess. Especially important are the leather gaskets provided with the kit. I have never seen leather used as gasket material before. However, after using the leather gasket from the kit to stop a leak from my sprayer, it appears to be a suitable gasket material and is compatible the spray fungicide chemicals i typically employ in my sprayer.
i give this kit a thumbs up as it stopped my leak with no more messes.