330PCS haisstronica Heat Shrink Butt Connectors-Marine Grade Waterproof Electrical Crimp Wire Connectors Kit-Tinned Red Copper Insulated, for Boat,Truck,Stereo,Joint(4Colors/4Sizes)

Works really good for my boat trailer, I live in Florida so it’s fully waterproof with the salt water here. Easy to wire I advise to use a heat gun or candle lighter don’t use a torch. Good product

They work and seal up very well

These are fantastic crimps. Buy the hassitronica crimp tool. Bought some ring terminal crimps from another brand and they included some butt crimps. All of them were low quality, weak crimps that didnt hold. These crimp solidly and the shrink wrap really holds the wire in place. I havent measured ohms across them but they seem to make solid connections. I am using them on an aem twin fire cdi igntion system which draws lots of power without issue as well as every other connection on my project car. Great value, will purchase again once I run out as I am on my second set already.

I use these often on auto audio and electrical. I like how they also have the heat shrink. Material seems of good quality thick and durable. Self explanatory so they are easy to use. I recommend this product.

These seem to do a great job sealing wire connections for the price. The only reason I didn’t give 5 stars is because the heat shrink is very soft so where your crimp tool hits the connector it always pierces through the heat shrink. But it doesn’t seem to be a big issue and probably is still weather tight.

Great quality. The heat shrink works great, and is waterproof if you make sure the wire jacket makes full contact.

I've purchased a half dozen kits that are advertised to be heat shrink connectors and the plastic either burns before it shrinks or doesn't shrink enough to seal the connector from the environment. These are the best I've found and a quarter the cost of the ones from the big vox stores. The sizes are true to gage. I use a small dab of dielectric/no-ox on the wire before crimping and it squeezes out when heated for a nearly waterproof connection. On marine applications I still use adhesive exterior grade heat shrink over the whole thing but that's probably overkill. Would highly recommend for their quality, ease of use, and ability to seal out the environment and hold wire tight. No complaints here.

Great product for the price. Would order again.