Sierra Shields Bilgeflex Marine Bilge Pump Hose - Available in 3/4" and 1 1/2" ID, 6' to 50' Lengths

The Sierra Shields Bilgeflex hose is a flexible, corrugated marine hose built for bilge pump discharge and general drain lines aboard a boat. It is constructed of black PVC with a flexible vinyl helix, giving it the corrugated wall that lets it bend tightly without kinking or collapsing while still standing up to abrasion. The hose resists mild chemicals and saltwater, and a clamping cuff molded in every foot of length gives installers a consistent, reinforced point to seat a hose clamp anywhere along the run.

This hose line is used primarily for bilge pump discharge, along with other onboard drain runs such as sink, shower, scupper, and livewell drains. It is not intended to be attached to a thru-hull fitting below the waterline. The line is offered in two inside diameters, 3/4 inch and 1 1/2 inch, each with its own bend radius and vacuum rating suited to the tighter or larger-volume routing a given drain run requires. Lengths run from a short 6 foot section up to a full 50 foot reel, and the 1 1/2 inch size is available in black or white so the hose can match the boat's plumbing or interior.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 16-120
• Material: PVC with flexible vinyl helix
• Color: Black or White (depending on variant)
• Inside Diameter: 3/4 inch (19.1 mm) or 1 1/2 inch (38.1 mm), depending on variant
• Bend Radius: 3/4 inch (19.1 mm) on the 3/4 inch hose; 2 inch (50.8 mm) on the 1 1/2 inch hose
• Vacuum Rating: 20 in. Hg
• Available Lengths: 6 feet, 50 feet
• Construction: Corrugated hose with a clamping cuff every foot
• Primary Use: Bilge pump discharge and drain lines (sinks, showers, scuppers, livewells)
• Installation Note: Do not attach to a thru-hull fitting below the waterline

Sizes & Options

Start by matching the Size to the inside diameter your bilge pump outlet or drain fitting requires: 3/4 inch or 1 1/2 inch. Next pick the Length that covers your run, 6 feet for a short discharge line or 50 feet for longer runs or multiple installations. On the 1 1/2 inch hose, also choose a Color, black or white, to suit the boat's existing plumbing.

Frequently Asked Questions

What sizes does the Sierra Shields Bilgeflex hose come in? The Sierra Shields Bilgeflex hose (Sierra part number stem 16-120) is available in 3/4 inch and 1 1/2 inch inside diameter, with lengths of 6 feet or 50 feet depending on the size selected.

How do I pick the right size and length for my boat? Match the Size option to the inside diameter of your bilge pump outlet or drain fitting (3/4 inch or 1 1/2 inch), then choose the Length that covers the run from the pump or drain to its discharge point; the Bilgeflex hose is offered in 6 foot and 50 foot lengths to cover both short and long runs.

Can this hose be used below the waterline on a thru-hull fitting? No, the Bilgeflex hose should not be attached to a thru-hull fitting below the waterline; it is designed for bilge pump discharge and drain lines above that point, such as sinks, showers, scuppers, and livewells.

What is the Bilgeflex hose made of? It is made of black PVC with a flexible vinyl helix, a corrugated construction that resists mild chemicals and saltwater while staying flexible enough to route through tight spaces.

Is there a clamp point along the length of the hose? Yes, the Bilgeflex hose has a clamping cuff molded in every foot of its length, so a hose clamp can be seated securely at any point along the run.

What is the bend radius of the 3/4 inch versus the 1 1/2 inch hose? The 3/4 inch Bilgeflex hose has a bend radius of 3/4 inch (19.1 mm), while the 1 1/2 inch hose has a bend radius of 2 inch (50.8 mm).

What vacuum rating does this hose carry? The Sierra Shields Bilgeflex hose line is rated to 20 in. Hg of vacuum across both the 3/4 inch and 1 1/2 inch sizes.

Does the 1 1/2 inch hose come in a color other than black? Yes, the 1 1/2 inch Bilgeflex hose is available in both black and white, letting it match the existing plumbing or interior color scheme.

What is this hose typically used for on a boat? It is used primarily for bilge pump discharge, as well as other onboard drain lines including sinks, showers, scuppers, and livewells.

Is the 6 foot length only available in one size? Based on the available options, the 6 foot length of the Bilgeflex hose is offered in the 3/4 inch inside diameter in black.

How long is the longest Bilgeflex hose option? The longest option in this Sierra Shields Bilgeflex line is a 50 foot length, available in both the 3/4 inch and 1 1/2 inch inside diameters.