Sierra 16-120-0346B
120 Bilgeflex · 3/4 in ID · 50 ft
Single-layer corrugated hose with regularly spaced clamping cuffs.
Sierra Shields Marine Hose: Bilgeflex, Multiflex & Vac
Choosing marine hose involves more than matching the inside diameter. Sierra's Shields hose range includes lightweight corrugated Bilgeflex for bilge discharge, helix-reinforced Multiflex for drains and fills, and heavy-duty Vac hose for more demanding marine service. Use the exact part number and the proposed connection location to select a suitable hose, not only the colour or nominal size.
What differs between Shields 120, 141 and 146?
120 BilgeflexA single-layer corrugated high-density polyethylene hose for appropriate bilge-pump discharge routing. It has clamping cuffs along the coil. Do not use it for below-waterline through-hull connections.
141 MultiflexFlexible clear PVC with a reinforcing black vinyl helix. Used for listed bilge discharge, potable-water tank filling and drains. It is not approved as a general below-waterline through-hull hose.
146 VacExtra-heavy-duty PVC with a white reinforcing helix. Shields identifies full-vacuum capability and applications that include bilge intake and discharge, drains and appropriate below-waterline service. Check installation-specific approvals.
Important hose safety: Do not assume Bilgeflex or Multiflex can replace hose connected to a through-hull below the waterline. Shields specifies application restrictions for the lighter 120 and 141 families. For any below-waterline connection, confirm the hose, seacock, fitting and clamps meet the boat manufacturer's requirements and applicable marine standards.
Sierra hose family, diameter and coil-length chart
Inside diameter, length and construction are tied to the exact manufacturer MPN. A hose of the same diameter may be designed for a different operating pressure, vacuum condition or mounting location.
| MPN | Series | Inside diameter | Coil length | Material / design | Product |
|---|---|---|---|---|---|
| 16-120-0346B | 120 Bilgeflex | 3/4 in ID | 50 ft | Corrugated polyethylene | View |
| 161201182B | 120 Bilgeflex | 1-1/8 in ID | 9 ft | Corrugated polyethylene | View |
| 16-141-0346B | 141 Multiflex | 3/4 in ID | 50 ft | Clear PVC, black vinyl helix | View |
| 16-141-1186B | 141 Multiflex | 1-1/8 in ID | 50 ft | Clear PVC, black vinyl helix | View |
| 161411126B | 141 Multiflex | 1-1/2 in ID | 50 ft | Clear PVC, black vinyl helix | View |
| 61412000BS | 141 Multiflex | 2 in ID | 100 ft | Clear PVC, black vinyl helix | View |
| 16-146-0340S | 146 Vac | 3/4 in ID | 100 ft | Heavy-duty clear PVC, white vinyl helix | View |
| 16-146-1000S | 146 Vac | 1 in ID | 100 ft | Heavy-duty clear PVC, white vinyl helix | View |
| 16-146-2000S | 146 Vac | 2 in ID | 100 ft | Heavy-duty clear PVC, white vinyl helix | View |
Compare the Sierra Shields hoses
Product cards below link directly to the exact UsedRVParts listings. Confirm the hose diameter and material as well as the required connection rating before ordering.
Bilgeflex 120 — corrugated bilge-discharge hose
Sierra 161201182B
120 Bilgeflex · 1-1/8 in ID · 9 ft
Shorter Bilgeflex hose; keep this family out of below-waterline through-hull connections.
Multiflex 141 — reinforced flexible hose
Sierra 16-141-0346B
141 Multiflex · 3/4 in ID · 50 ft
Helix-reinforced hose with greater flexibility for correctly supported runs.
Sierra 16-141-1186B
141 Multiflex · 1-1/8 in ID · 50 ft
Larger inside diameter in the same 141-series family.
Sierra 161411126B
141 Multiflex · 1-1/2 in ID · 50 ft
One-and-a-half-inch hose; verify fitting and bend clearance.
Sierra 61412000BS
141 Multiflex · 2 in ID · 100 ft
Larger two-inch hose coil with its own bend radius.
Vac 146 — extra-heavy-duty marine hose
Sierra 16-146-0340S
146 Vac · 3/4 in ID · 100 ft
Heavy-duty full-vacuum-rated hose; check all applicable marine requirements.
Sierra 16-146-2000S
146 Vac · 2 in ID · 100 ft
Two-inch heavy-duty hose, distinct from the 141-series two-inch coil.
Marine hose selection questions
Are Bilgeflex 120 and Multiflex 141 the same?
No. Bilgeflex 120 is corrugated polyethylene made primarily for bilge discharge. Multiflex 141 is reinforced PVC with a black helix and a broader list of permitted fill and drain applications. Always check the exact product and location.
Can I use a corrugated bilge hose on an underwater hull fitting?
Not merely because it fits the hose barb. Shields excludes Bilgeflex and Multiflex from specified below-waterline through-hull service. Use only hose and hardware approved for the vessel's particular installation.
Is a two-inch Vac hose the same as a two-inch Multiflex hose?
No. Both have nominal two-inch inside diameters, but the 146-series Vac hose is a different heavy-duty, full-vacuum-rated construction from 141 Multiflex.
Does the hose diameter have to match the bilge pump's outlet?
Yes, the system must be sized according to the pump and installation instructions. Avoid constricting a discharge line or assuming a different hose diameter will preserve the manufacturer's rated pump flow.
Can any of these hoses be used with glycol antifreeze?
Do not assume so. Shields identifies chemical and antifreeze restrictions for some hose families. Check the exact model's chemical-compatibility guidance before using any antifreeze or cleaning agent.
Related marine pump guides
For pumps requiring different hose discharge diameters, see Albin cartridge and low-profile bilge pump selection and Rule bilge pump model comparison.
Follow the hose manufacturer's current technical documentation for pressure, temperature, chemical resistance and below-waterline applications.
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