Description

The Hayward SX311F is the replacement bulkhead fitting for Pro Series Plus side mount sand filters. It is the genuine Hayward part.

What it does

A bulkhead fitting is the sealed pass through where plumbing meets the filter tank. It has to hold pressure against the tank wall without distorting it, which is why a weeping bulkhead is replaced rather than cranked tighter. Overtightening a fitting to chase a drip is a common way to crack a tank.

Check your model

The parts group this fitting belongs to covers the S311SX, S311SXV and S360SX. The short listing narrows it to the S360 built in 1999 and prior. Both readings appear in the source, so read your tank label and confirm the model and build year before ordering.