What does 'parts warranty' mean?

Where quoted - Many of the items on our site comes with a 'parts warranty'. If any fault occurs, we operate a no quibble warranty system where we will send any required replacement parts to you on a next day delivery service where possible, completely free of charge for a period of your warranty from the date of purchase or installation. (Please retain your original invoice number to validate this) Warranty registration with the relevant manufacturer is necessary in all cases