How to Install a Hose Kit on a Water Bladder Guide

Setting up a hose kit on your water bladder is a simple process when you follow the right steps. Whether you're installing it in your 4WD, caravan, trailer, or using it for camping, getting the installation right ensures leak-free performance and long-term reliability.

What You'll Need

Before you begin, gather the following items. Most of these are included in your water bladder hose kit package:

Know Your Bladder Configuration

Take a moment to familiarise yourself with the bladder fittings. Different models have different configurations:

Model	DW105B	DW110BDC
Fitting Configuration	Single combined Inlet/Outlet fitting at one end + Breather fitting on top panel	Two separate Inlet/Outlet fittings (one at each end) + Breather fitting on top panel
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Key Points to Remember:

• The 1/2" top panel fitting connects to the breather hose, allowing air to escape during filling and helping prevent pressure build-up. When filling the bladder inside your vehicle, simply open the breather cap and place the hose end outside the vehicle. This allows air and any excess water to release safely, helping keep your vehicle dry.
• The 1/2" fittings are positioned at the lowest point of the bladder’s side panel and can be used as both inlet and outlet connections. This location helps ensure efficient water flow and allows you to drain as much water as possible.

Step 1 – Install the 90° Elbow Fittings

Please note that some water bladder models may not include 90° elbow fittings, as the integrated bladder fitting already comes with a straight barb end.

Where supplied, the 90° elbow fittings with a barb end are designed to connect to the Male BSP fitting, allowing you to attach your hoses and direct them in your preferred direction.

Important Note  Poly Fittings:

Installation Steps:

• It's much easier to fit the 90° elbow fittings to the bladder before attaching the hoses to the barbs.
• Screw the 90° elbow fittings female thread into place by hand until they stop and you feel resistance.
• Before fully tightening, rotate each elbow so the barb points in the direction you want the hose to run.
• Using a wrench or strap wrench, tighten the fitting an additional ¼ to ½ turn (90°–180°) until snug.
• Crucial: Do not overtighten. Poly (plastic) fittings are strong but can crack if forced. If you meet significant resistance, stop immediately.

Step 2 – Prepare the Hoses

• Slide one hose clamp onto each end of the 750mm hose.
• If you require a shorter hose, trim it cleanly using a hose cutter or sharp knife.
• Insert barb of the tap / valve to the one end of the hose that will serve as your Inlet/outlet. Secure it tightly using a screwdriver.
• Insert barb of director into the end of the other hose. Attach the breather cap to the end of the male BSP thread of the director. Secure it tightly using a screwdriver.

Step 3 – Install the Inlet/Outlet Hose

• Take the hose fitted with the tap and push it firmly onto the barbed of 90° elbow fittings at the end of the bladder.
• Ensure the hose is pushed all the way down, covering the entire barbed section.
• Slide the hose clamp up over the barb and tighten it securely with a screwdriver.
• Give the hose a firm tug to confirm it is locked in place and won't pull off under pressure.

Step 4 – Install the Breather Hose 

• Take the hose with the director and push it firmly onto the barb of the 90° elbow fittings.
• Ensure the hose is pushed all the way down, covering the entire barbed section.
• Slide the hose clamp into position over the barb and tighten securely.
• Ensure the breather cap is firmly attached to director thread—this prevents dust, dirt, and insects from entering your water supply.

Step 5 – Final System Check

Before filling the bladder completely, run through this quick checklist:

• All hose clamps are tight and secure.
• All hoses are fully seated on their barbed fittings.
• Hoses are routed without sharp kinks that could restrict water flow.
• The tap operates smoothly.
• All fittings are snug but not overtightened.

What to Do If You Have a Leak from the Fittings

Discovering a leak at the threaded connection between the elbow and the bladder can be frustrating, but it's usually easy to fix. Here's how to address it:

1. Identify the Source

Turn off the water supply or lower the water level below the fitting. Dry the area thoroughly with a cloth so you can clearly see where the leak is originating.

2. Tighten Gently

Sometimes the fitting simply wasn't tightened enough. Give the elbow an additional ⅛ turn (45°) with your wrench.

⚠️ Important: Do not overtighten. If you feel significant resistance, stop immediately to avoid cracking the poly fitting.

3. Add More PTFE Tape 

If tightening doesn't resolve the issue, the thread seal may need reinforcement.

• Unscrew the elbow completely.
• Remove all old tape from the threads.
• Wrap 5–6 layers of fresh PTFE tape tightly around the male threads (clockwise).
• Reinstall the fitting using the hand-tight + ¼ turn method. The additional tape will fill any microscopic gaps and create a reliable seal.

4. Check for Cross-Threading

If the fitting was installed at an angle, the threads may be damaged. In this case, forcing the fitting further will not stop the leak—you may need to replace the elbow or the bladder fitting adapter.

5. Cracked Fitting

If you have overtightened and the poly fitting has cracked, it cannot be repaired. You will need to replace the fitting with a new one.

Leak Caused by the Male Fitting Backing Out of the Locking Nut

Symptoms:

Water leaking from the base of the bladder fitting itself—where the fitting passes through the bladder wall—rather than from the threaded connection between the elbow and the fitting.

Cause:

This occurs when too much clockwise force is applied to the male thread during installation of the 90° elbow. The rotational force transfers through the threads and starts to back the male fitting out of the locking nut on the inside of the bladder. When this happens, the compression seals lose pressure, and the bladder will leak.