INCLUSION & COMPATIBILITY — This kit is a Brass Gearcase Adapter Set w/ 1/4" Hose barb fitting for a leak-free connection to 3 adapters. It fits most Chrysler, Evinrude, Force, Johnson, Mariner, Mercury outboards, Suzuki, Tohatsu, and Yamaha lower units.
EASY INSTALLATION AND REMOVAL — When paired with our gearcase pressure and vacuum tester, our Brass Gearcase Adapter Kit helps for a quick connection to make the installation and removal process easier and faster during pressure/vacuum testing.
IDEAL TOOL FOR DIYERS & PROS — Whether you're just starting to work on your boats or are a seasoned marine mechanic, this adapter set makes gearcase maintenance more manageable and stress-free.
BUILT & DEVELOPED WITH A MISSION — We are on a mission to support boat owners and mechanics in their boating lifestyle through the tools we create like this Brass Gearcase Adapter Set.
LIFETIME WARRANTY — As a small business located in Charleston, South Carolina, USA, we take pride in all our tools. They are all built to last, backed with a lifetime warranty.
Customer Reviews
4.4
4.4 out of 5 stars
88%
5Reviews
60%of customers recommend this product
5 stars3(100%)
4 stars0(0%)
3 stars0(0%)
2 stars0(0%)
1 star0(0%)
Sort by
Rating
Newest
Helpfulness
TWEED
I recommend this product
GREAT GEARCASE ADAPTERS GREAT WORKMANSHIP ...
5
Feb 17, 2026
GREAT GEARCASE ADAPTER GREAT WORKMANSHIP WORKS GREAT WITH MY VAC/PRES TESTER HIGHLY RECOMMEND
These adapters work great. Unfortunately, I purchased the gearcase pressure/vacuum testing kit with these adapters included. One of them was defective so I had to purchase this additional kit so I could use the tool I purchased. Customer service was of no
5
Aug 2, 2023
These adapters work great. Unfortunately, I purchased the gearcase pressure/vacuum testing kit with these adapters included. One of them was defective so I had to purchase this additional kit so I could use the tool I purchased. Customer service was of no help to me.
The adapters are fine as far as function. The knurls on the adapters SUCK! Whoever is making these needs more practice knurling!
Just poor workmanship and quality!
Your hands are going to be oily which is the purpose of the knurls to get a grip.
I will leave this review here even though I certainly disagree with your assessment of 2 star quality of the machining. Maybe the knurls could be a bit deeper for your liking but they are clean and the parts are nicely made. - Leon (owner)
Navy Chief
Verified Buyer
Perfect loose very little oil when I disconnect
5
Nov 25, 2021
Hello. I stopped by the shop a few weeks back and picked up the gear case adapters brought them to the shop and they love them. Bought a set just for me