Dometic SMEV 25mm Straight Waste Water Fitting

Dometic SMEV 25mm Straight Waste Water Fitting

The Dometic/Smev 25 mm Straight Waste Water Fitting is a plumbing connector designed specifically for use in caravans, motorhomes, campervans and boats to join 25 mm waste pipes in sink, shower or basin drain installations. This straight waste fitting creates a secure, leak-resistant link between two sections of corrugated or rigid waste hose/pipe, helping ensure smooth drainage of grey water from your vehicle’s fixtures.

Made to OEM standards by Dometic/Smev — leading manufacturers of leisure vehicle kitchen and washroom components — this fitting is ideal for repairs, upgrades or new installations where a reliable straight-through connection is needed. Its simple design and robust build make it a dependable part of your waste water system.

Key Features

• Type: 25 mm straight waste water connector

• Compatible with: Dometic/Smev domestic sinks, wash basins, shower trays

• Material: Durable plastics suitable for waste water applications

• Provides a secure, leak-resistant joint for waste pipes

• Designed for caravan/motorhome/boat plumbing

• Suitable for connecting corrugated or rigid waste hose

Weight

• Approximate Weight: 0.10 kg (100 g)

How and Where It Is Used

The Dometic/Smev 25 mm Straight Waste Water Fitting is installed in the waste drainage system of your leisure vehicle to join two sections of 25 mm waste pipe in a straight, inline arrangement. It is commonly used in locations such as:

• Under a sink or basin — connecting the waste outlet from the bowl to the main drain run

• Shower waste systems — providing a straight connection between waste outlets and drain hoses

• Grey water plumbing loops — where space and alignment permit a direct link

• Repair or replacement of worn or damaged waste connections

Typical installation scenarios include:

• Caravan kitchens where a sink waste connects into a main waste line

• Motorhome washrooms joining shower or basin drains

• Campervan conversions with bespoke sink/shower plumbing

• Marine heads where standard 25 mm waste plumbing is used

This fitting works with industry standard 25 mm waste hose. It is generally used alongside clips, seals or hose clamps appropriate to your plumbing style, creating a neat and reliable connection that resists leaks and maintains good wastewater flow.

Uses

• Connecting sink waste outlets to drain lines

• Joining shower waste hoses in washroom systems

• Repairing broken or worn waste pipe connections

• Providing a straight-through link in caravan/motorhome grey water plumbing

• Helping ensure fast and reliable drainage in touring vehicles

Fitting Instructions

Tools Needed:
Utility knife or pipe cutter, hose clips or clamps (suitable for 25 mm hose), screwdriver.

1. Turn Off Water Supply:

   • Before working on any plumbing, ensure the water supply is off and waste pipes are drained.

2. Prepare Waste Pipes:

   • Measure and cut the waste hose or pipe squarely using a pipe cutter or sharp utility knife.

   • Clean any debris or rough edges from the cut ends.

3. Insert Fitting:

   • Push each end of the waste hose over the straight fitting’s smooth ends. Ensure the hose is seated fully onto the fitting (past any ridges).

4. Secure With Clamps:

   • Slide a waste hose clamp over each joint.

   • Tighten the clamps securely using a screwdriver — not too tight to crush the hose, but enough to prevent leaks.

5. Align & Support:

   • Check that the waste line is straight and properly supported under the sink/basin/shower area so there’s no stress on the joint.

6. Test for Leaks:

   • Turn the water back on (low flow) and check that waste drains without drips or moisture at the fitting.

   • Tighten clamps or reposition hoses if needed.

Tips:

• For corrugated hose, push the hose onto the smooth shank as far as possible; if it struggles, warm gently with hot water to increase flexibility.

• Use fresh hose clips to ensure a secure, long-lasting connection.

Why Choose This Waste Fitting?

The Dometic/Smev 25 mm Straight Waste Water Fitting is a standard, reliable plumbing part tailored to the drainage systems found in caravan, motorhome and marine applications. Its straightforward design, compatibility with common waste hoses and OEM quality make it ideal for both new installations and maintenance jobs — helping ensure your grey water drains efficiently and without leaks throughout your travels.