The L-com FOATSC-31-20D is a bulkhead attenuator for 1310nm wavelength and is rated for 20db. The L-com FOATSC-31-20D is the perfect solution for attenuating Single mode fiber connectors for both lab and commercial applications. The FOATSC-31-20D is constructed of the highest quality materials, is factory tested, and are In Stock. Order today!