How to service a FIt Once cartridge that has been installed in a Vaillant ecoTEC or early Glow-worm boiler. This video demonstrates how quick and easy it is to replace the seal canister when a Fit Once™ cartridge has been installed. The replacement seal canister comes with full fitting instructions.

Fit Once™ is manufactured by Buycombi Ltd and is compatible with Vaillant ecoTec and early Glow-worm diverter valves. Check your boiler compatibility on our shop page, see link below:

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