The Genuine Briggs parts for Tank 4437 contain all of the available parts. We only offer genuine repair parts for the 4437 Biggs tank. We offer many parts available to replace the parts on your tank. All of the parts offered are genuine and replace the old parts. We carry many replacement parts for Briggs tanks. We have them in stock. They are the genuine replacements for the old parts you have. Also all of the parts we offer come complete.