The Chapin Pro Series 4 Gallon Backpack (#61800) does not have a release value. Pressure is released as you are opening the lid on the tank.
You can change the shut-off assembly that the Chapin Pro Series 4 Gallon Backpack (#61800) has with the Chapin Shut-off Assembly – Poly With Gaurge (6-8175).
Yes, the Chapin Pro Series 4 Gallon Backpack (#61800) can be used with insecticides like the Demand CS.
Per the manufacturer of the Chapin Pro Series 4 Gallon Backpack, the straps are adjustable for a custom fit.
The Chapin Pro Series 4 Gallon Backpack (#61800) comes with a Brass Cone Adjustable Nozzle, Plastic Adjustable Cone Nozzle, and a Plastic Fan Tip Nozzle, which allow for varied spray patterns, including pin stream, fan, fine mist and course stream. Please refer to the product manual for specific instructions regarding these interchangeable nozzles, and their spray patterns.
The Chapin Pro Series 4 Gallon Backpack (#61800) is hand pump, not battery or engine operated, so there is not a set volume of product per seconds when using this type of equipment. The speed at which the product comes out will partially be determined by your ability to pump it up and create pressure in the tank. In general, you would mark off about 1000 sq/ft of area in your yard and spray with just water in your tank and walk as normal across this section. However much water you used during this is how much you will know you use per 1000 sq/ft going forward with applications based on your walking speed and what you feel sufficient coverage is for your treated surfaces. On average you will use about 2 gallons of water per 1000 sq/ft for a pre emergent application, but you may find you use a little less or more. You can view our video on How to Calibrate your Sprayer to see this explained further.
Yes, the Chapin Pro Series 4 gallon backpack sprayer is a very good option for precision spraying. There are different tip sizes available, such as pin stream, fan, fine mist and coarse stream, to give you the best and most accurate spray depending on what you are wanting to do. There is also an internal 4 position spray valve allows for expert pressure control from 15psi to 60 psi.
The Chapin Pro Series 4 Gallon Backpack can be strapped on by following these steps: The top of the shoulder straps are attached to the tank. Attach the lower end of the straps by clipping the strap hooks to the metal frame between where the frame exits the tank and curves around. Please see detailed instructions here, in the manual.