Features. The Hayward Vacuum Gauge for Swimming Pool Filters is a 30 psi pressure gauge featuring a standard 0.25 inch brass fitting.. This affordable replacement gauge is easy to manage and install onto your swimming pool filter or vacuum.. Type - Gauge . Materials - Plastic and brass. 0.25 in. brass fitting. 30 psiThe Hayward Vacuum Gauge for Swimming Pool Filters is a 30 psi pressure gauge featuring a standard 0.25This affordable replacement gauge is easy to manage and install onto your swimming pool filter or vacuum.Type - GaugeMaterials - Plastic and brass0.25 in. brass fitting