Scientific Anglers Sonar Stillwater Seamless Density Sinking Line S5/S7

The Scientific Anglers Sonar Stillwater Seamless Density S5/S7 is built for anglers who need precision control and depth accuracy when fishing stillwaters.

Designed to get down fast and stay connected to your flies, this line features Seamless Density technology for a perfectly smooth transition between sinking rates—no hinging, no sag, just a direct connection from rod tip to fly.

Based on the proven MPX taper, it’s overweighted by two line sizes to easily turn over multiple flies and long leaders. Textured 10- and 20-foot hang markers provide consistent reference points for precise depth control and strike detection. The Sink 5 running line and Sink 7 head (7.0 ips) combination makes this the fastest-sinking Stillwater line in the series—ideal for covering deep water and targeting fish holding near the bottom.

Features:

• Seamless Density tech eliminates hinging and ensures smooth energy transfer
• Sink 5 running line with Sink 7 head for maximum depth performance
• Based on the versatile MPX taper, overweighted by two line sizes
• Textured hang markers at 10' and 20' for consistent reference points
• Designed specifically for stillwater trout fishing in deep lakes or reservoirs

Best For: Deep-water stillwater anglers targeting trout or other subsurface species.

Q: What types of fly lines do you sell?
A: Drift Outfitters carries fly lines for every fishing style and species — from delicate trout presentations to heavy saltwater setups. You’ll find floating, sinking, and intermediate lines, along with specialty tapers for Euro nymphing, spey casting, and warmwater fishing.

Q: How do I choose the right fly line for my rod?
A: Match the line weight to your rod weight (for example, a 5wt line for a 5wt rod). The type of fishing you do matters too — floating lines are best for dry flies, while sinking or sink-tip lines are ideal for streamers or deep-water presentations.

Q: What’s the difference between weight-forward and double-taper lines?
A: Weight-forward (WF) lines have their weight in the front for easier casting and distance, making them the most popular choice for most anglers. Double-taper (DT) lines offer smoother roll casts and can be reversed for extended use — great for traditional or delicate presentations, however many weight forward lines also offer these benefits, making DT lines less popular.

Q: Which fly line brands do you carry?
A: We stock leading brands RIO, Scientific Anglers, Airflo, and more. Each brand offers premium coatings, slick finishes, and tapers designed for maximum performance in both fresh and saltwater.

Q: How do I clean and maintain my fly line?
A: Rinse your line with warm, soapy water and dry it with a soft cloth to remove dirt and buildup. Use a fly line cleaner or dressing periodically to restore slickness and extend its lifespan. Proper care keeps your line floating high and casting smoothly.

Q: How often should I replace my fly line?
A: With proper cleaning and care, most fly lines last several seasons. However, if your line begins to crack, lose buoyancy, or feel sticky, it’s time for a replacement to maintain casting performance.