These are priced per pair. All the prices include vat and postage charges to UK mainland.

Suitable for use with Bowman heat exchanger models:

5113-1
5113-2
5113-3
5113-5
3705-3
4495-3
4223-2
4233-2
4695-3
4805-3
4825-5

NB. Further O rings are available for larger models. P on A.