Scientific Anglers 5 Weight Sonar Sweep Parabolic Sink Fly Line
The U-shaped sink is a unique and incredible feature. A must for more advanced stillwater fishing.
Sonar Stillwater Parabolic Sink lines sink in a U-shape through the water column, suspending flies just below the bottom and creating enticing action with each strip. Built with 10- and 20-foot textured hang markers, these lines are a stillwater angler’s dream and something many fish will never have seen before.
Features
- Designed specifically for the demands of stillwater anglers
- Based on popular MPX taper
- Overweighted by two line weights for multiple flies and long leaders
- Features 10-foot and 20-foot textured hang markers
| Line Weight | Length Options | Special Feature |
|---|---|---|
| 5 Weight | 10-foot and 20-foot textured hang markers | U-shaped sink pattern for improved fly presentation |
FAQ
How does the U-shaped sink work in stillwater fishing?
The U-shaped sink allows the fly line to sink in a curved path through the water, suspending the fly just below the bottom. This creates natural movement and action that mimics live prey, attracting fish in stillwater environments.
Are the hang markers adjustable or fixed?
The hang markers are fixed at 10-foot and 20-foot intervals. They help anglers determine the depth of the line and maintain consistent presentation.
Can this line be used with different types of flies?
Yes, the overweighted design supports multiple flies and long leaders, making it suitable for a variety of fly types and fishing scenarios.


Diana Kerr –
This line delivers excellent action in quiet lakes. The U-sink pattern keeps the fly just below the surface, which fish respond to. The 20-foot marker helps me set the depth accurately. Great for targeting bass and panfish in stillwater.
Justin Parsons –
I’ve tried several sink lines, and this one stands out. The movement is smooth and natural. The textured markers are easy to spot and help with depth control. A bit more expensive, but worth it for serious stillwater fishing.
Jessica Fraser –
Used this line in a slow-moving pond and saw a noticeable increase in strikes. The fly stays suspended and moves with the current. The 10-foot marker is perfect for shallow areas. Highly recommend for beginners and pros alike.