Double sealed cap and is suitable for use on a sealed recovery system In a sealed recovery system the cap (double seal) allows coolant to flow to and from the recovery or expansion tank maintaining the integrity of the cooling system Please note If your cap is the single seal type IE only one rubber seal (small rubber end of spring) Large rubber can be easily removed You will receive your goods as soon as possible. After receipt of payment, your parcel will be shipped immediately. As a rule, you can expect your parcel to be delivered within three working days. We are at your side both before and after the purchase with words and deeds. Contact us if you have any questions using the ebay contact form and we will get back to you as soon as possible If you are not satisf.