$57.99 CAD
$72.48 CAD
Astro Pneumatic AST-405 Air Caulking Gun - red pneumatic caulk gun, side profile view
Astro Pneumatic AST-405 Air Caulking Gun - red pneumatic caulk gun, wider angle view
Astro Pneumatic AST-405 Air Caulking Gun - red pneumatic caulk gun, side profile view
Astro Pneumatic AST-405 Air Caulking Gun - red pneumatic caulk gun, wider angle view

Astro Pneumatic AST-405 Air Caulking Gun

SKU: AST-405
(96)
Sale price
$57.99 CAD
Regular price
$72.48 CAD
You save
$14.49 CAD (20%)

Only 8 left! Usually ships in 24 to 48 hours.
Est. Arrival Nov 11 - Nov 13
Pickup available at Mississauga Warehouse

Usually ready in 4 hours

Check availability at other locations
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The Astro Pneumatic AST-405 Air Caulking Gun is a pneumatically powered dispensing tool engineered for precise, smooth-flow application of caulking, adhesives, and sealants from standard cartridges. Designed for professional-grade performance, it operates within an air pressure range of 40-90 psi to deliver consistent, controlled output with minimal waste. The gun accommodates standard 2-inch I.D. tubes up to 8-1/4 inches in length, making it compatible with a wide range of common cartridge formats. Lightweight at just 2.8 lbs, it reduces operator fatigue during extended use on the job site or in the shop.

Features

  • Permits smooth, consistent flow caulking for precise application

  • Dispenses caulking, adhesives, and sealants from standard cartridges

  • Compatible with standard 2-inch I.D. cartridge tubes

  • Accommodates tube lengths up to 8-1/4 inches

  • Lightweight design at 2.8 lbs for reduced operator fatigue

Specifications

Air Pressure: 40-90 psi
I.D. Size (Tube): 2 inches
Tube Length: 8-1/4 inches
Net Weight: 2.8 lbs
Drive Type: Air (Pneumatic)

Shipping

  • We will usually ship your order in 1 to 2 business days! Orders purchased before 2:00 pm EST may be shipped the same day.
  • Your order must have a subtotal of $199 or more to be eligible for free shipping.
  • The delay of your order will depend on your location and from which warehouse your order is shipped from. We will always ship your order from the closest available warehouse. Based on our experience, we estimate the transit time to be between 1 to 3 business days across Canada (excluding NWT, Yukon and Nunavut) and 2 to 5 business days to USA.
  • All orders will be shipped from Canada.
  • You may pick up your order at one of our warehouses, Monday to Friday, from 8 am to 5 pm. Pickup orders are usually ready within 4 hours.

Returns

We are offering a 30-day money-back guarantee!

If you are not satisfied with your purchase within 30 days of receiving the product, you can ship it back to us for a refund or exchange.

Before returning the item, kindly send us a request using the Self-Serve Return option or contact our customer support team to get your return authorization. You may contact us by email at support@mprtools.com, phone at 1-800-905-0410, or chat through our website. We are available Monday to Friday from 8 am to 5 pm ET.

We want to guarantee your experience with us will be outstanding. Here are just a few of the reasons why mprtools.com is the go-to company to get your tools from:

1-Year Price Match Guarantee

We work very hard to ensure we offer the absolute best prices online. If you find it at a lower price somewhere else within 365 days of purchasing, please message us, and we’ll credit you back the difference right away.

30-Day Money-Back Guarantee

It's our duty to provide superior quality tools you can trust to get the job done. If you're not fully satisfied with your order, you can request a return for a complete reimbursement.

Customer Reviews

Based on 96 reviews
76%
(73)
24%
(23)
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R
RidgeRunner
Worked great. Used for windshield adhesive

Worked great. Used for windshield adhesive. Adhesive came out with a nice bead and no effort. Not bad for the price.

T
The Editor
Caulking was impossible. Now it's easy

UPGRADE to five stars. This tool will lay a perfect bead for as long as I can hold the trigger or until the caulk runs out, whichever comes first. Applying caulk used to be a major job. Now the major job is preparation. Caulking itself takes minutes. I ran through six tubes of caulk in one use easily. I'm caulking the joint/gap between the floor and the wall throughout the house, per the weatherizing advice of my local utility company. It's a big job. Without the air gun, I couldn't do any of it.

It took some time to find my way around the tool. i learned by making mistakes and by picking up information others shared in reviews. For my fellow inexperienced users:
1) This air-powered caulk gun came with no instructions. Granted, it's a caulk gun. But it hooks up to an air compressor. Its wonky trigger works best if you ignore the smooth, shiny, finger-ready curve and squeeze it from the underside.
2) The connector hole on the gun is threaded and empty. Buy a male connector at Lowe's (unless you have a male connector at the tool end of your hose). Screw it in. Snap its nose into the hose's female quick-connector.
3) The hose is 3/8" (internal diameter); air leaves it and enters connected devices through 1/4" NPT inlets [NPT = National Pipe Thread Taper]. This is standard.
4) Wrap the threads on the black base of the caulk-tube holder with Teflon tape to prevent air leaks.
5) A secondary pressure gauge and regulator, connected between the hose and the caulk gun, gives you more control over caulk speed and bead size. Screw a male connector into the hose side of the regulator, a female into the gun side, and snap in place. I bought the Bostitch BTFP72326 Regulator and Gauge Kit with 1/4-Inch NPT Thread. It works great.
6) Work out the settings for the bead you want on a piece of paper or cardboard before you start caulking for real. Start with 40 psi leaving the compressor and 20 psi going into the gun.
7) Make sure your caulk is fresh. If it's immovable, the air escapes around the tube. An unopened tube doesn't guarantee fresh caulk.

G
Garwa
Works wonderfully!

Saves on hand cramping. Just wish the trigger design gave you more room for your fingers.

M
Mpg
Five Stars

It works however use the lowest pressure you can

C
Cheyanne Figueroa
Five Stars

worked as stated.

123

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