Genuine Thetford replacement rubber perimeter seal for the Service Door 3 (SD3) commonly fitted to caravan and motorhome cassette-toilet access compartments.

The seal fits around the service door to create a tight weather-resistant barrier, helping prevent rainwater, moisture, dust and dirt entering the cassette compartment. Ideal for replacing an original seal that has become flattened, cracked, brittle or damaged.

One point worth making clear in the advert: 26601 is specifically for Service Door 3. The larger Thetford service doors use different seals—for example, Door 4 uses 26605, Door 5 26610, and Door 6 26611.