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.
The Chapin Pro Series 4 Gallon Backpack (#61800) has an adjustable cone nozzle which would give you the best coverage.
Please view the Guidelines for Spray Nozzle Selection Guide for more information.
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.
The Chapin Pro Series 4 Gallon Backpack should not be used to disperse stain/sealers. The Chapin 3.5 Gallon Concrete Sprayer is a professional grade high-quality sprayer that can be used to disperse sealers.
Yes, the Chapin Pro Series 4 Gallon Backpack (#61800) can be used with insecticides like the Demand CS.
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).
The Chapin Wand (#6-8141) fits the 61700 SPR 4.0G/15.1L Chapin poly backpack sprayers and the Chapin 4 Gallon Tree/Turf Pro Commercial Backpack Sprayer (61900). We would recommend contacting Chapin directly to troubleshoot and identify specifically what parts are needed for the Chapin Professional 4 Gallon backpack sprayer. Please click the link below to view the replacement parts diagram listed on page 11 of the product manual below.
Chapin can be reached at 1-800-444-3140 for troubleshooting.
The Retaining Nut for the Chapin 4 Gallon Backpack Sprayer (Model 61800) is not sold separately. The Chapin Replacement Sprayer Tube (6-8219) includes the wand and the retaining nut.
We recommend contacting Chapin directly for troubleshooting and product support regarding the problems you are experiencing with your Chapin Pro Series 4 Gallon Backpack (#61800).
Chapin can be reached by either calling (800) 444-3140 Opt. 1, or by visiting their website's contact page.
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 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.