I just received with totally unclear instructions. How do you preset them?

You let the air out of your tires and use a tire guage. Say you want it at 18 PSI. after you have the tire at the desired psi put the deflators on and turn them until the air starts to come out. There are many youtube videos showing how to use this exact product.

My tires are at 38 psi. Will this work to deflate to 20 or is 30 the max regular psi it works on?

6 - 30 psi is the pressure range that the deflators will deflate your tires to, so if you are normally running 38 psi in your tires they will deflate them to anywhere between 6 - 30 psi depending on where you set them at.

How do you set the psi? No directions in package.

Instructional Video/MP3 - To view an instructional video on how the Staun Tyre Deflators work and see first hand how easy they are to operate please download the mpeg file below.View instructional videoDeflators are supplied at a preset pressureThe deflators are supplied at a preset pressure, however you can adjust this pressure to your desired level. It is not necessary to reset them again unless you wish to change the psi that you want to reduce your tyre pressure to.Exactly how much you reduce your tyre pressure depends on a variety of factors, such as how much weight your tyres are supporting. Additionally the softness of the surface that you are travelling on will also affect how much you need to let your tyres down. Through trial and error you can find your personal preference and determine what tyre pressure suits you.Staun Tyre Deflators do not have a minimum start off pressure so you do not need to bring your tyre pressure back up in order to reduce it further. Simply turn the adjusting cap anti-clockwise to further reduce your tyre pressure. If they do not start automatically you can manually start them by lifting the pin. Please check your product header card for individual pressure settings.The Staun Tyre Deflators need to be screwed on using the finger grip located at the base of the deflator body. Do not use the adjusting cap or lock ring to fix the deflator to the valve stem. For a comprehensive demonstration on how to install the deflators onto your tyres please view the video above.Available RangesStaun Tyre Deflator - Light Duty (0-10psi)SCVLDThis deflator has been designed for those who require lower pressure ranges with extreme accuracy. Suitable for competitive Rock Crawlers & Dune Buggies who deflate to as low as 4 - 5 psi with bead locks.This model comes preset at 7 psi and has an adjustment of 2 psi per half turn and 4 psi per full turn of the adjustment cap. It also only requires 2 psi above its preset pressure to start automatically, but can be manually started by lifting the pin as little as 1 psi above the preset pressure.Staun Tyre Deflator - Standard (6-30psi)SCV5This deflator has been designed to suit most 4WD deflation needs. Suitable for beach or bush pressures it comes preset at 18psi and is accurate to within 0.25psi.It has an adjustment of 3psi per half turn and 6psi per full turn of the adjustment cap. Requiring 12 psi above its preset pressure to start automatically, they can be started manually by lifting the pin at as little as 2 psi above its preset pressure.Staun Tyre Deflator - Heavy Duty (15-55psi)SCVHDThe heavy duty deflators are distinguished from the standard by having an extra exhaust hole.This deflator is designed to deflate to and from higher pressures. It is also accurate to within 0.25psi. Designed for use in the light to heavy trucking industry, it is also suitable for agricultural and farming equipment.This model comes preset at 35psi and has an adjustment of 4psi per half turn and 8psi per full turn of the adjustment cap. It requires 20psi above its preset pressure to start automatically or can be manually started by lifting the pin at as little as 2 psi above its preset pressure.Staun Tyre Deflator - Camper Trailer Pack (4 at 6-30psi and 2 at 15-55psi)SCV5/HDThis unique set comes with 4 Standard deflators and 2 Heavy Duty deflators. Designed to suit those who tow camper trailers and vans off road and on the beach. While your 4WD tyres are deflated to your preferred pressure, the trailer would normally deflate to different pressures based on the weight of the trailer/van.This set allows you to deflate your 4WD and trailer at the same time without having to adjust your 4WD deflators to deflate your trailer/van. Your 4 Standard deflators are preset at 18psi and the 2 Heavy Duty deflators are preset at 22psi.

What is the adjustment range?

Depends.Usualy you can find fifferent sets covering fifferent ranges,I bought 4 different sets and I preseted each set on a different value so I can chose to which pressure I want to deflate according to the terrain.

Manufacturer	AutoEC
Brand	AutoEC
Item Weight	6.7 ounces
Package Dimensions	4.37 x 2.91 x 1.14 inches
Is Discontinued By Manufacturer	No
Manufacturer Part Number	AutoEC
Voltage	12 Volts

AutoEC Tire Deflator, Adjustable Brass Tyre Deflator Kit for Off Road Tires, Car, Truck, Jeep and ATV (4 Pack)

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