This Float Shaft Extension is used with the LS200 ONLY. One extension is supplied with each float operated level switch when you make your original purchase. This is intended as a replacement part. Use of additional extensions is not recommended as they reduce the ability of the unit to operate for the stated specific gravity. The Float Shaft Extension is 1" (25.4 mm) in length and has an overall length of 1-3/8" (35 mm) when adding the exterior threading (3/8"). This extension is threaded 12-24 NF (interior) and 12-24 UNF (exterior). Material: AISI 304, UNS-S30400.