does the hose it comes with attach to the tire either screw on or other?

This Compressor set up comes with everything you need and the hose comes with an air chuck on it..and attachments forairing up air matress, balls, etc. if your going to air up all tires if you let the air out for being in sand give it some time to cooloff inbetween each tire, it does a great job! its not a shop compressor with a big air tank but it is faster than most portable units. its been a great tool to have since I go way out on hunts in the boonies and helped out a few stranded peopleand had a tire plug kit handy as well. good way to earn some 12 packs!

Can the psi be controlled to a constant 40psi in order to blow out RV water lines for winterization?

With an external regulator, yes. Google RV Geeks Winterizing and go to t=40 seconds to see their solution when using a 150 PSI Viair compressor to blow out their RV water lines. (Sorry, Amazon won't let me post the link here).

It states it has a 1 year warranty! Yet, no returns. How does the warranty work?

I don't know. It's the seller's policy. You are allowed to email the seller to get the details. Keep clicking on the seller's product section to find the contact link. BTW, this is a heavy duty pump. I had a tire with about 30# and within seconds, it got up to 36#. I recommend the VIAIR 300P.

I need to 'top off' my rv tires up to 125 psi. from anyone with experience... will this compressor work? if you don't know, please don't answer.

Hello, We recommend the 400P-Auto or 400P-RV since the 300P's gauge will only show up to 100psi. Let us know if you have any other questions. Thanks, Viair Corp.

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Description

🚙 Inflate Fast, Explore Farther – Never Get Stuck Waiting!

RAPID TIRE INFLATION - Inflates 33" tires from 15 to 30 PSI in under 3 minutes—get back on the trail fast
COMPLETE INFLATION KIT - Includes 25 ft 5-in-1 hose, Presta valve adapter, and deluxe carry bag for ultimate convenience
ALL TERRAIN COMPATIBILITY - Perfect for trucks, SUVs, Jeeps, motorcycles, and even mountain bikes
DURABLE WEATHER RESISTANT - IP54 rated with aluminum sand tray and vibration isolators for long-lasting reliability
POWERFUL 12 V GEARLESS MOTOR - Heavy-duty, maintenance-free performance for rugged offroad use

The VIAIR 300P is a compact, portable 12V air compressor designed for offroad enthusiasts and professionals alike. Delivering up to 150 PSI with a 2.3 CFM airflow, it rapidly inflates tires up to 33 inches, making it ideal for trucks, SUVs, Jeeps, and bikes. Built tough with an aluminum chassis, vibration isolators, and IP54 dust/water resistance, it comes complete with a 25-foot multi-function hose, Presta adapter, and deluxe carry bag—ensuring you're always ready for your next adventure.

Specifications

Manufacturer	Viair Corporation
Part number	30033
Item Weight	3.95 Kilograms
Product Dimensions	22.86 x 12.45 x 19.05 cm; 3.95 kg
Item model number	30033
Color	Silver
Style	Air Compressor Kit
Material	Aluminum
Power source type	Battery Powered
Voltage	12 Volts
Amperage Capacity	30 Amps
Maximum Power	414 Watts
Item Package Quantity	1
Number Of Pieces	1
Air Flow Capacity	2.3 Cubic Feet Per Minute
Maximum Pressure	150 Pound per Square Inch
Noise Level	73 Decibels
Hose Length	25 Feet
Specification met	certified frustration-free
Special Features	Compact design with fast tire fills
Included components	25ft 5-in-1 Inflator/Deflator Air Hose with Inline 100 PSI Gauge, Deluxe carry bag anti-vibration tray and more.Air Hose Length: 25 ft.Power Cord Length: 8 ft
Batteries Included?	No
Batteries Required?	No

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