Adventure Parks Compression Spring Braking System - Zip Line Brake

Use this for my 100’ zip line in my backyard. It stops me (220lbs) plus a kid and doesn’t miss a beat. It does spring you back a little ways but once the kids knew to hold on a bit after reaching the end it was no big deal. I would absolutely buy this again.One note I forgot is I had to drill out the two rubber stops and their plastic sleeves to fit my 5/16” braided steel line. It was a tight fit and would be the max you could push those rubber caps. It would only fit MAYBE a 1/4” line out of the box. If those caps fail I’ll probably put a small wood block or something for the trolley to hit and compress the spring so I don’t damage the spring or trolley system.**Edit after 1 year of use**The end cap that comes in contact with the trolley is pretty munched up *similar to the picture attached to another review. However, it is still holding up enough so that the trolley doesn't jam up into the spring itself. The second cap that sits against my u-bolt saddle clamp still looks pretty much new so if I really break off the end cap that is damaged and need something in a pinch I can swap the two around. I also might just bolt a two small blocks of wood with a hole drilled in the middle to slip over the line in front of the spring as well. You could also buy a more expensive zip line brake block and make that your trolley contact point but I don't see any reason to do that short of lack of basic tools/materials that most people could find lying around the house or in a Home Depot cut scrap pile. I'm keeping the 5 star rating. This thing is running like a champ and the kids and their friends have ridden the zip line hundreds of times with no contact to the anchor tree.

I had to buy two of these to work for our zip line and still ended up using The bungee brake as well. I would recommend this for kids that weigh under 75 lbs or for zip lines with a minimal incline.

I hesitated buying this....~$40 each!?! My cheapness gave in and I bought two and am very happy with the purchase. Better than I expected. Before purchasing this, I watched my 9 year old daughter slam into the tree hard and fast (glad the wife didn't witness that one!). Now I consider this a required safety item considering how often kids use the 100' zipline we have in the backyard. I've only used this when there are two of these in a row on the zipline. While I think one would be way better than none, two work very well.I have these on a 3/8" steel cable, which is a lot more girth than this spring is rated for. (Note: a DYI backyard zipline DOES NOT need a 3/8" steel cable! That was WAY overkill. I'd do 1/4" if I did it again, but that is still a lot more than needed). These barely fit on a 3/8" cable and it took me a while to get them squeezed onto it. The plastic/rubber ends will definitely not fit on a 3/8" cable, even after using a 3/8"+ drill bit through them. I doubt the rubber ends would fit on a 1/4" cable even when drilled wider. I put a block of wood with a hole drilled through it between the trolley and spring. Without the wooden block, my trolley would go right over the spring as if it was the steel cable.

Worked better than I had expected. Definitely worth the purchase. The end holed in the rubber caps on the ends were a bit small for my cable, but I just drilled out to accommodate it and it worked great!

Pay close attention to the recommended zipline cable size!! It is not meant for larger diameter zip line cables and is designed for 5/32" cable! Most zipline kits come with at least 3/16" cable. Mine was overkill at 3/8" cable. The spring does fit on 3/8 cable as others have mentioned, but it is better as a backup brake, unless you have your slope fairly low. I use a self-designed bungy brake with this spring as my backup. Obviously the rubber pads that come with this spring do not fit my cable, so I don't use them.

Does NOT fit standard zipline cable. End is too small to fit cable. Return period is also short and now I’m stuck with a $30 useless spring. Do not buy.

This zip line break was easy to install and works very well for both kids and adults. My grandsons love the way it bounces them half way back across the line. Without it riders could easily slam into the tree at the end of the run. I am surprised the original zip line came without one.

Fairly Easy install and works well but VERY DISAPPOINTED that after LESS THAN THREE HOURS of use one end of the rubber stoppers is already chewed up and getting stuck to the trolley.