Replaces ESPA-4021 Hydranautics Nitto 1000 GPD at 100 PSI 4 x 21 inch Membranes

Non-OEM Compatibility:

This product is a high-quality, non-OEM compatible replacement membrane designed to function as an alternative to original manufacturer components. While engineered for direct fit and functional compatibility, specific performance metrics and technical specifications—including, but not limited to, permeate flow rate (GPD), operating pressure (PSI), and salt rejection percentages—may vary from the exact specifications of the original OEM target model. It is the customer's sole responsibility to cross-reference these specifications with the original part to ensure the replacement meets their specific operating requirements prior to purchase and installation. All brand names, part numbers, and logos are the property of their respective owners and are used solely for identification and cross-reference purposes. This product is not affiliated with, endorsed by, or sponsored by any original equipment manufacturer.

AI-Assisted Content & Information Accuracy:

We strive to ensure that all product descriptions, specification tables, testing data, visual media, and cross-reference information are accurate and up-to-date. However, content presented on this page—including, but not limited to, product gallery images, product descriptions, technical specification tables, bulleted data, and any other associated text or media elements—is compiled, generated, or formatted with the assistance of artificial intelligence (AI). While we review this content for general accuracy, AI-assisted data can contain errors, omissions, or inaccuracies. All information is provided for general reference purposes only. We are not legally liable for typographical errors, visual misrepresentations, omissions, or inaccuracies within product descriptions, tables, images, or equivalent-model recommendations. We expressly disclaim all liability for damages, system failures, misapplications, or voided warranties resulting from reliance on any information presented on this site.

Manufacturer Updates & Official Specifications:

Manufacturers frequently revise product designs, component materials, and technical specifications without prior notice. Official manufacturer documentation and data sheets are the sole authoritative sources for all product specifications and strictly supersede any physical dimensions, specifications, or visual representations presented on this page. It is the customer's sole responsibility to independently verify all technical data—including but not limited to pressure ratings, dimensions, material compatibility, and performance metrics—against the official manufacturer data sheet prior to purchase and installation.

Order Verification & Chargeback Policy:

It is the buyer's sole responsibility to independently verify that the exact manufacturer part number being ordered is correct and entirely compatible with their specific application prior to checkout. By placing an order, you explicitly agree that if the physical item shipped perfectly matches the manufacturer part number listed on your official invoice, the order is legally considered fulfilled as described. Disputes or chargebacks claiming an item is "Not as Described" based on supplementary website text, specification tables, AI-generated content, or compatibility assumptions will not be recognized or honored.

Pricing, Availability & Right to Cancel:

All prices, promotional offers, and inventory statuses are subject to change without notice. In the event a product is listed at an incorrect price or with inaccurate stock availability due to a typographical, technical, or system error, we reserve the right to refuse or cancel any orders placed for that item. If an order is canceled after your payment has been processed, a full refund will be initiated immediately to your original payment method.