Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1APJ1 found under Valve Float Water Closet Tank by Grainger Div Of W W Grainger Inc. The National Stock Number assigned to this part is 4510015868086, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1APJ1.