The Hayward SP1056 Hydrostatic Relief Valve is a critical safety component designed for use in in-ground pool main drains. It helps prevent structural damage to your pool by automatically releasing groundwater pressure that can build up beneath the pool shell—especially in high water table areas or after heavy rains.

This hydro relief valve is commonly installed in concrete or gunite pool main drains, acting as a one-way valve that opens under pressure to prevent floating or cracking of the pool surface.

Key Features:

• Genuine Hayward replacement part (SP1056)
• Designed for main drains in in-ground pools
• Releases hydrostatic pressure caused by rising groundwater
• Durable, corrosion-resistant plastic construction
• Easy installation and replacement

Compatible With:

• Most in-ground concrete/gunite pool main drain sumps
• Hayward main drain assemblies

Don’t risk costly damage to your pool shell—install or replace your hydrostatic relief valve with a trusted, reliable solution from Hayward.

Available now from ultimatepools.ca, Canada’s trusted pool parts and service provider.