The Chapin 1 Gallon Pump Sprayer (#20000) would be a good choice for applications to cracks and crevices indoors.
If the liquid is escaping out the top of the Chapin 1 Gallon Pump Sprayer (#20000), this could be the bottom valve or check valve at the bottom of the pump. Click HERE to view the product manual for part numbers and basic troubleshooting ideas. If you continue to have issues with leaking, we would suggest contacting Chapin directly for assistance in troubleshooting your sprayer. Chapin can be reached at (800) 444-3140.
Unfortunately there is not another wand or extension available for the Chapin 1 Gallon Pump Sprayer (#20000).
The Chapin 1 Gallon Pump Sprayer comes with an adjustable nozzle that can produce a pin stream, cone pattern, or coarse stream. There is also a fan tip available that can be purchased separately.
Yes, the Chapin 1 Gallon Pump Sprayer would be a great option for you.
The Chapin 1 Gallon Pump Sprayer (#20000) does not have an on off switch. You will activate this sprayer by pumping up the air pressure until you feel resistance, then it has enough pressure built up in the tank so that you can begin spraying. When you feel the spray getting weaker, it is time to pump more air pressure into the tank. To release the air pressure you will simply lock the handle and turn it counterclockwise until you hear the air escaping. Here is the manual for this sprayer.