Newborn 377 Caulk Gun 29 oz
- 29 fluid ounces cartridge capacity
- 10:1 thrust ratio, steel construction
- 5.3 pounds item weight
- Spout cutter and seal puncture tool included
- Instruction guide in the box
- Gray, water resistant
Last refreshed Oct 3, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A heavy steel caulk gun for large sealant and adhesive cartridges used on subfloors, ceilings and roofs. It is heavy, so it is not for light trim caulking.
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ASIN: B000BOAC44Model: 377Category: Caulking Guns
Overview
Loading oversize sealant cartridges into a steel frame is what this Newborn caulk gun does, with thrust to push adhesives and sealants. It comes with a built-in spout cutter and seal puncture tool and an instruction guide.
The reason to buy is the large capacity and steel build, so one cartridge covers long runs without constant reloading. The limitation is the weight, which tires the hand on overhead work, and the thrust ratio is modest for the stiffest adhesives.
Who it's for
Contractors who go through big cartridges of sealant and adhesive on construction jobs. Homeowners with an occasional bathroom bead should choose a lighter gun, and the listing names no smaller cartridge size.
Pros and cons
- Large cartridge capacity
- Cutter and puncture tool built in
- Instruction guide included
- Heavy to hold
- Smaller cartridge fit not listed
- Plain finish, no grip details
- Modest thrust for stiff adhesive
Performance notes
Capacity decides how often the cartridge needs swapping, and a gun this size carries a big load per fill. Thrust ratio governs trigger effort, so thick adhesive takes more squeezing than it would on a higher-ratio gun.
Specifications
| Brand | Newborn |
|---|---|
| Model | 377 |
| Dimensions & fit | |
| Item weight | 5.3 pounds |
| Package Height | 109.22 cm |
| Package Length | 8.382 cm |
| Package Width | 19.304 cm |
| Capacity & performance | |
| Cartridge capacity | 29 fluid ounces |
| Construction & materials | |
| Material | Steel |
| Color | Gray |
| Included components | |
| Included | Unit, Instruction Guide |
| Other details | |
| Thrust ratio | 10:1 |
| Surface recommendation | Tile, Pipe, Counter Top, Window, Door, Sink, Tub, Walls, Gutter |
| Item form | Gel, Liquid |
| Water resistance | Water Resistant |
| Product Type | Building Material |
Frequently asked questions
Will the Newborn 377 fit standard 10 oz caulk tubes?
The listing names 29 oz cartridges and gives no smaller size, so this is a large-cartridge gun. Check cartridge dimensions before using standard tubes.
Does the Newborn 377 include a spout cutter?
Yes. The description says it includes a spout cutter and a seal puncture tool.
What does the listing mean by 45 inches?
The maximum gap fill field and the description both show 45 in. The listing does not explain it, so treat it as unverified.