When selecting flexible hoses and related accessories for marine water tanks, choose items designed for reliability, bend resistance, and compatibility with RVs, boats, and camp setups. This guide highlights five practical options that balance flexibility, length options, and ease of use for gravity-feed systems. The ideal buyers are boaters, RV owners, and campers who need dependable, kink-resistant connections that simplify installation and ongoing maintenance.
| Product | Brand | Length / Size | Best For |
|---|---|---|---|
| A.A 1-3/8″ Fill Hose with Flats (5 ft) | A.A | 1-3/8″ ID, 5 ft | RV and concession setups requiring easy clamps |
| 1.25″ Fill Hose for RV Concession (5 ft) | Automotive Authority LLC | 1-1/4″ ID, 5 ft | Compact gravity-fill connections |
| F.S.P 1-1/2″ Fill Hose (3 ft) | F.S.P | 1-1/2″ ID, 3 ft | Moderate-length fills with strong rigidity |
| ZY-hosetube Suction Hose 3/4″ ID (10 ft) | ZY-hosetube | 3/4″ ID, 10 ft | Suction and discharge prep; shallow or rigid routing |
| ZY-hosetube 3/8″ ID Vinyl Tubing (10 ft) | ZY-hosetube | 3/8″ ID, 10 ft | Low-pressure transfer and flexible routing |
The following sections detail each product, including who it’s best for, why it’s a fit, and a practical caveat to consider before purchase.
A.A 1-3/8″ Fill Hose with Flats (5 Feet)
This 1-3/8″ ID fill hose with flats is designed for RV gravity water fills, using hose clamps for secure attachment. It’s made from ethylene copolymer for excellent flexibility and minimal kinking, making it a strong choice for long, low-friction runs in marine setups. Best for boaters and RVers who need a reliable, clamp-friendly connection and straightforward installation.
Best for: RVs, concession trailers, and marine gourds where a 5-foot length accommodates typical fill routes. Choose this if you value easy clamping and flexible routing. Caution: clamps are not included, so you’ll need to supply them separately.
A.A 1-3/8″ Fill Hose with Flats (10 Feet)
This longer 10-foot variant shares the same flat-clamp design and ethylene copolymer flexibility as the 5-foot version. It’s ideal for larger boats or installations where the fill point is farther from the tank, reducing the need for fittings. Best for: users needing extended reach without sacrificing kinking resistance.
Best for: larger marine setups and busy campgrounds. Caution: longer hoses require careful routing to avoid tangling or tripping hazards aboard tight spaces.
1.25″ Fill Hose for RV Concession (5 Feet)
This 1-1/4″ ID hose is compatible with standard hose clamps and connects RV gravity fills to water tanks. Ethylene copolymer construction provides flexibility with minimal kinking. Best for: compact RVs or boats where a smaller diameter is preferred and space is limited.
Better for: scenarios requiring a lighter, easier-to-route hose. Limitation: clamps are not included, so you’ll need to source them separately.
F.S.P 1-1/2″ Fill Hose (3 Feet)
This 1-1/2″ ID hose is designed for gravity fills with a shorter 3-foot length, offering a robust option for tighter spaces where a larger diameter is needed but space constraints apply. Ethylene copolymer formulation keeps kink resistance high while maintaining flexibility. Best for: setups requiring a larger internal diameter without long routing.
Choose this if you want a more rigid, high-flow option in a compact footprint. Limitation: only 3 feet long, so check reach before purchase.
A.A 1-3/8″ Fill Hose with Flats (10 Feet)
The 10-foot version extends the classic flat-clamp design with the same ethylene copolymer flexibility, giving more reach for larger boats or distant fill points. Best for: boats with longer routes or multiple tanks that need a single hose to cover the distance.
Better for: reducing clamp substitutions during longer trips. Limitation: longer hose may require careful storage aboard to prevent tangling.
Potable Thermal Expansion Tank 1 Gallon
While not a hose, this 1-gallon potable expansion tank supports marine water systems by managing pressure fluctuations and reducing water hammer. It features a 3/4″ MNPT connection with a corrosion-resistant stainless body and EPDM diaphragm that’s compatible with potable water. Best for: marine systems needing improved stability and longevity in hot or fluctuating pressure environments.
Choose this if you’re adding a compact water-pressurization element to a small vessel or RV. Caution: ensure compatibility with your existing plumbing layout and operating pressure requirements.
Buying Guide
What to consider when choosing flexible hoses for marine water tanks:
- Size and compatibility: Ensure the hose ID matches your fill valve and clamps; mismatches reduce reliability.
- Material and flexibility: Ethylene copolymer hoses offer kink resistance and flexibility, but check temperature tolerance for your climate and water temperature.
- Length versus routing: Longer hoses provide reach but may complicate storage; plan how you’ll coil or store hoses on board or in an RV compartment.
- Clamps and fittings: Some products exclude clamps; budget for compatible clamps to ensure leak-free connections.
- Durability and exposure: For marine environments, consider UV resistance and abrasion resistance if hoses are exposed to sun or rubbing against surfaces.
- Expansion tanks and system stability: An expansion tank reduces pressure swings and water hammer, extending system life in intermittent-use settings.
How to choose by scenario
- Small boats with tight spaces: Opt for 1-1/4″ or 1-3/8″ hoses with flats for clamp-friendly connections and compact routing.
- RVs with multiple tanks: Consider longer hoses (5–10 ft) to minimize fittings and simplify alignment between tanks and fills.
- Systems prone to pressure fluctuations: Add a small potable expansion tank to dampen shocks and protect lines.
Installation tips
- Inspect hose ends for burrs; cut cleanly to avoid leaks at clamps.
- Use the correct clamps and snug them evenly to prevent leaks without crushing the hose.
- Route hoses away from heat sources and sharp edges; use protective sleeves if needed.
Frequently Asked Questions
- What size hose is best for RV gravity fills?
Common options are 1-1/4″ or 1-3/8″ ID hoses, chosen based on fill valve size and desired flow rate.
- Do hoses require clamps?
Most hoses require clamps to secure fittings; check product notes for clamp inclusion.
- Can I use a standard garden hose for marine tanks?
Garden hoses are not ideal for gravity fills due to differing fittings and potential debris; use purpose-built marine hoses.
- Is an expansion tank necessary?
Not always, but a potable expansion tank helps manage pressure spikes and extends pump life in variable-use systems.
- What about 10 ft hoses?
Long hoses reduce fittings but must be stored safely; they may be less practical in compact cabins.
- Which hose should I choose for tight spaces?
Smaller diameter hoses with flats for clamp mounting work well in restricted areas.