Offer available until Sunday 12th may 2019 unless ended earlier. We reserve the right to end the promotion at any time without warning or to extend the trade-in promotion. Only available from the NiSi Australia Website at www.nisifilters.com.au. The 20% discount only applies to selected NiSi products. The 20% discount can NOT be combined with any other discount, coupon code or offer. The 20% discount is the highest and final discount possible. The Trade in holder must be returned to NiSi Australia via our Pre-Paid shipping and the discount code will only be supplied once received. The 20% discount and trade in offer is only available to Australian residents currently in Australia. Free return shipping is available in Australia only.