We also carry large stocks of East African roofing washers and caps, a more flexible, durable, and weatherproof alternative to spat washers. Simply purchase the East African roofing washers, and then select which cap you would like to go with them. Once the cap is pushed onto the washer, you have a waterproof seal.
The caps are quite difficult to get off once pushed onto the washer, so we wouldn’t recommend testing too many out before fitting.