Replace for Hayward FDXLWPS1930 Water Pressure Switch Fit for Hayward Universal H-Series Low NOx Pool & Spa Gas FD Heaters, Black Product Description Material: Copper, Steel, Aluminum Alloy and Plastic Package Weight: 0.08kg Size: 6.3*6.1*6.1cm Package included: 1* FDXLWPS1930 Water Pressure Wide Range of ApplicationsThe FDXLWPS1930 Water Pressure Switch is designed to use with Hayward Universal H-Series (Forced-Draft) Heaters: H150FDN, H150FDP, H200FDN, H200FDP, H250FDN, H250FDP, H300FDN, H300FDP, H350FDN, H350FDP, H400FDN, and H400FDP. It is also compatible with Hayward ASME Forced Draft Heaters: H250FDNASME, H250FDPASME, H400FDNASME, and H400FDPASME. Also fit for Hayward H-Series A/G H135 Heaters: H135ID1, and H135IDP1. Special RemarksThis water pressure switch is for use only with Hayward Universal H-Series (forced-draft) gas heater models. These heaters can be identified by checking the heater nameplate (there should be FD in the model number). Used only on heaters made AFTER 5/11/2010. Function of Water Pressure SwitchThis FDXLWPS1930 Water Pressure Switch in the heater is designed to ensure that the water pressure is sufficient for proper operation, and when the pressure switch fails, it will prevent the heater from turning on, preventing further damage to other components.It is an affordable part and very easy to be installed. Superior Material & High QualityThe FDXLWPS1930 Water Pressure Switch is made of high-quality Copper, Steel, Aluminum Alloy and Plastic. It is durable and not easy to wear and tear, aging and corrosion. Better quality materials allow this kit to be used for a longer time. Satisfaction GuaranteeWe are committed to providing excellent products and the best service for our customers. If you are not satisfied with the product, you can simply return it. We support a 30-day full refund on return and a 12-month warranty. If you have any problems with our items or services, please feel free to contact us first before you leave negative feedback. We will do our best to solve any problem and provide you with the best customer services.