{"id":8762,"date":"2026-02-17T11:34:40","date_gmt":"2026-02-17T11:34:40","guid":{"rendered":"https:\/\/www.poolparthub.com\/?post_type=product&#038;p=8762"},"modified":"2026-03-24T10:11:07","modified_gmt":"2026-03-24T10:11:07","slug":"astralpool-o-ring-118-x-4-mm-4405010437","status":"publish","type":"product","link":"https:\/\/www.poolparthub.com\/nl\/product\/astralpool-o-ring-118-x-4-mm-4405010437\/","title":{"rendered":"Astralpool o-ring 118 x 4 mm &#8211; 4405010437"},"content":{"rendered":"<h2>Astralpool o-ring 118 x 4 mm 4405010437<\/h2>\n<p>The Astralpool o-ring 118 x 4 mm 4405010437 is a replacement elastomer seal used to restore watertightness on compatible Astralpool pool<br \/>\nequipment. With an internal diameter of approximately 118 mm and a 4 mm cross section, it is designed to fit the dedicated groove on<br \/>\nselected lids, flanges or unions and provide a reliable, long lasting seal under normal filtration pressure.<\/p>\n<h3>Main features of the Astralpool o-ring 4405010437<\/h3>\n<ul>\n<li>Original style o-ring with 118 mm inner diameter and 4 mm section.<\/li>\n<li>Designed for Astralpool pool components that specify reference 4405010437.<\/li>\n<li>Manufactured from elastomer suitable for treated pool water.<\/li>\n<li>Round cross section for even compression in standard o-ring grooves.<\/li>\n<\/ul>\n<h3>Function in the filtration system<\/h3>\n<p>This o-ring is mounted in a machined or moulded groove between two mating parts, such as a pump lid, inspection cover, union or flange.<br \/>\nWhen the parts are assembled and tightened, the o-ring is compressed slightly, filling the gap and preventing water or air from passing<br \/>\nthrough the joint.<\/p>\n<ul>\n<li>Provides a watertight and airtight seal along the contact surface.<\/li>\n<li>Helps maintain stable suction and discharge pressure in the circuit.<\/li>\n<li>Reduces the risk of drips and air ingress in the technical room.<\/li>\n<\/ul>\n<h3>Compatibility and typical applications<\/h3>\n<p>The Astralpool o-ring 118 x 4 mm 4405010437 is intended for use on Astralpool pool pumps, filters or accessories that list this reference<br \/>\nin the exploded view or spare parts list. The dimensions are matched to the original groove, so the seal can be installed directly<br \/>\nwithout modification.<\/p>\n<ul>\n<li>Suitable for Astralpool components that specify 4405010437 as sealing o-ring.<\/li>\n<li>Ideal for replacing worn or flattened seals on compatible lids or unions.<\/li>\n<li>Recommended when refurbishing older equipment to restore full sealing performance.<\/li>\n<\/ul>\n<p>Always confirm the code in the documentation or on the parts diagram of your specific model to ensure the o-ring size is correct.<\/p>\n<h3>When to replace the o-ring 118 x 4 mm<\/h3>\n<p>O-rings are consumable parts that gradually lose elasticity under the combined effects of pressure cycles, temperature changes and pool<br \/>\nchemicals. A tired or damaged seal can lead to leaks, air entry and unstable pump operation.<\/p>\n<ul>\n<li>Visible cracks, cuts or rough areas on the o-ring surface.<\/li>\n<li>Flattened, shiny appearance from long term compression in the groove.<\/li>\n<li>Persistent seepage or air bubbles at the joint even after careful tightening.<\/li>\n<li>Disassembly of the component for maintenance, where reusing the old seal is not recommended.<\/li>\n<\/ul>\n<h3>Installation and maintenance tips<\/h3>\n<p>Fitting the Astralpool o-ring 118 x 4 mm 4405010437 is a simple operation, but careful handling helps ensure a reliable seal and longer<br \/>\nservice life.<\/p>\n<ul>\n<li>Switch off the pump and depressurise the system before opening any sealed component.<\/li>\n<li>Remove the old o-ring and clean the groove and contact surfaces to eliminate dirt and scale.<\/li>\n<li>Check that the new o-ring is clean, undamaged and correctly sized for the groove.<\/li>\n<li>Place the o-ring gently into the groove, making sure it is not twisted or stretched unevenly.<\/li>\n<li>Apply a thin film of silicone based lubricant suitable for pool seals if desired, to reduce friction and ease assembly.<\/li>\n<li>Reassemble the parts and tighten evenly, avoiding excessive force that could crush or deform the o-ring.<\/li>\n<\/ul>\n<p>After reassembly, restart the filtration system and inspect the joint carefully during the first minutes of operation to confirm that the<br \/>\narea remains completely dry and that no air is being drawn into the circuit.<\/p>\n<h3>Good practice for longer o-ring life<\/h3>\n<p>A few routine habits help the Astralpool o-ring 118 x 4 mm 4405010437 provide efficient sealing over many seasons.<\/p>\n<ul>\n<li>Maintain balanced water chemistry to limit chemical stress on elastomer components.<\/li>\n<li>Clean sealing surfaces before closing lids or unions to avoid pinching grains of sand or dirt.<\/li>\n<li>Do not use tools to overtighten closures; hand tightening is usually sufficient.<\/li>\n<li>Replace seals preventively during major services rather than waiting for visible leaks.<\/li>\n<\/ul>\n<p>With a correctly installed Astralpool o-ring 118 x 4 mm 4405010437, compatible pool equipment recovers secure, watertight joints that<br \/>\nsupport stable, efficient filtration in daily use.<\/p>","protected":false},"excerpt":{"rendered":"<p>Astralpool o-ring 118 x 4 mm 4405010437 The Astralpool o-ring 118 x 4 mm 4405010437 is a replacement elastomer seal used to restore watertightness on compatible Astralpool pool equipment. With an internal diameter of approximately 118 mm and a 4 mm cross section, it is designed to fit the dedicated groove on selected lids, flanges<a href=\"https:\/\/www.poolparthub.com\/nl\/product\/astralpool-o-ring-118-x-4-mm-4405010437\/\">Continue reading <span class=\"sr-only\">&#8220;Astralpool o-ring 118 x 4 mm &#8211; 4405010437&#8221;<\/span><\/a><\/p>","protected":false},"featured_media":8764,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"bwfblock_default_font":"","inline_featured_image":false},"product_brand":[920],"product_cat":[1721],"product_tag":[],"class_list":["post-8762","product","type-product","status-publish","has-post-thumbnail","product_brand-astralpool","product_cat-spare-parts","first","instock","taxable","shipping-taxable","purchasable","product-type-simple"],"acf":{"pph_product_template":"spare_part","pph_extra_parts_check":"","pph_spare_parts":null,"pph_extra_spare_parts":null,"extra_product_tabs":null,"main_product_link":null,"restock_info":"","exploded_view_link":"","details_product":[{"text_details_type":"yes","text_details_product":"Correct 118 x 4 mm size for Astralpool parts that specify 4405010437 "},{"text_details_type":"yes","text_details_product":"Restores watertight and airtight sealing on compatible lids or unions "},{"text_details_type":"yes","text_details_product":"Easy to install during routine maintenance or refurbishment "},{"text_details_type":"yes","text_details_product":"Low cost spare that can solve many small leak and air ingress issues"},{"text_details_type":"no","text_details_product":"Only suitable where this exact o-ring size and reference is specified "},{"text_details_type":"no","text_details_product":"Elastomer still ages over time and should be replaced periodically"}],"details_product_exploded":null,"pph_card_badge_use_custom":false,"pph_card_badge_text":"","pph_card_badge_background_color":"#ADC2F7","pph_card_badge_border_color":"#ADC2F7","pph_card_badge_text_color":"#2B46AB"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.4 (Yoast SEO v27.7) - 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