Pentair Sight Glass® 1-1/2" Slip | Sand & D.E. Filters | 50901600 Pool & Spa Lighting Filter Area 14

Filter Area 14

The first and only flow meter for pools and spas to be certified for outdoor use

Assembles easily

The compact 9" length and 5 5/16" outer diameter slot precisely into the filter housing

This CS-301 is for the large 10-hole faceplate back position only and does not include the double-wall gasket

Pentair Sight Glass® 1-1/2" Slip | Sand & D.E. Filters | 50901600 Pool & Spa Lighting Filter Area 14OEM Replacement Sight Glass for Sand and D. E. Filters The Pentair Sight Glass (50901600) is the OEM replacement 1 1 2" slip sight glass for Pentair sand and D. E. filters. If your existing sight glass is cracked, cloudy, or leaking, this is the direct replacement part. What It Does The sight glass provides a visual inspection port on the filter's multiport valve or plumbing assembly, allowing you to observe water flow and clarity during backwash and