Pentair In-line Slip Sight Glass - 1-1/2 Inch 50901600

Pentair 50901600 Sight Glas(R)s For Sand D.E. Filter; 1-1/2 Inch Slip

Keep an eye on your pool’s water flow with the genuine Pentair In-line Slip Sight Glass (1½″). This OEM replacement part is designed for easy inline installation and provides a clear view into your plumbing to monitor backwash clarity, verify flow, and catch issues early.

Key Features:

Fits 1½″ slip-socket plumbing for pool and spa filtration systems.

Clear housing lets you visually inspect water clarity — especially useful during backwash/rinse cycles.

Built to OEM quality for durability in chemical-exposed, pressurized environments.

Straightforward replacement: just cut into your pipe, glue it in place, and you’re done.

Ideal for: adding a sight glass to your filtration loop or replacing a cracked, cloudy, or missing one so you can more easily determine when your filter’s water is clear and the backwash cycle is complete.