Product Information Includes: Flapper return springs Material: Aluminum Female Thread: NPT Select a Product Part NumberSealFemale Thread SizeLength 3020TEWhite EPDM2"5-1/8" 3031TEMetal-to-metal3"7-1/8" 4042TEWhite silicone4"9" 3030TE-SSPWhite silicone3"7-1/8" 4041TEMetal-to-metal4"9" 4040TEWhite EPDM4"9"