{"id":8792,"date":"2026-02-17T12:14:17","date_gmt":"2026-02-17T12:14:17","guid":{"rendered":"https:\/\/www.poolparthub.com\/?post_type=product&#038;p=8792"},"modified":"2026-03-24T10:10:56","modified_gmt":"2026-03-24T10:10:56","slug":"astralpool-o-ring-38-x-5-mm-4405010439","status":"publish","type":"product","link":"https:\/\/www.poolparthub.com\/nl\/product\/astralpool-o-ring-38-x-5-mm-4405010439\/","title":{"rendered":"Astralpool o-ring 38 x 5 mm &#8211; 4405010439"},"content":{"rendered":"<h2>Astralpool o-ring 38 x 5 mm 4405010439<\/h2>\n<p>\nThe Astralpool o-ring 38 x 5 mm 4405010439 is a replacement elastomer seal designed to restore watertight joints on compatible Astralpool<br \/>\npool equipment. With an internal diameter of approximately 38 mm and a 5 mm cross section, it fits precisely in its dedicated groove and<br \/>\nprovides a reliable, long lasting seal in everyday filtration operation.\n<\/p>\n<h3>Main features of the o-ring 38 x 5 mm<\/h3>\n<ul>\n<li>Original style o-ring with 38 mm inner diameter and 5 mm section.<\/li>\n<li>Designed for Astralpool components that specify reference 4405010439.<\/li>\n<li>Round cross section for uniform compression in standard o-ring grooves.<\/li>\n<li>Elastomer material suitable for treated pool water and normal operating temperatures.<\/li>\n<\/ul>\n<h3>Function in the filtration system<\/h3>\n<p>\nThis o-ring is installed between two rigid parts, such as a union tailpiece, valve insert or inspection cap. When the parts are assembled<br \/>\nand tightened, the Astralpool o-ring 38 x 5 mm 4405010439 is slightly compressed, filling the gap and preventing water or air from passing<br \/>\nthrough the joint. A sound seal helps maintain stable suction and pressure and keeps the technical room dry and clean.\n<\/p>\n<ul>\n<li>Provides a watertight and airtight barrier at critical joints.<\/li>\n<li>Helps the pump maintain correct priming and stable flow.<\/li>\n<li>Reduces the risk of small leaks and damp patches around fittings.<\/li>\n<\/ul>\n<h3>Compatibility and typical applications<\/h3>\n<p>\nThe Astralpool o-ring 38 x 5 mm 4405010439 is intended for use on specific Astralpool pumps, filters or accessories that list this<br \/>\nreference in their exploded view or spare parts list. Its dimensions are matched to the original groove design, so the seal can be<br \/>\ninstalled directly without modification.\n<\/p>\n<ul>\n<li>Suitable for Astralpool equipment that specifies o-ring 4405010439.<\/li>\n<li>Ideal for replacing worn or flattened seals on compatible unions or caps.<\/li>\n<li>Recommended as a spare in maintenance kits for installations using Astralpool components from PoolParthub.com.<\/li>\n<\/ul>\n<p>\nTo ensure correct selection, always check the parts diagram or documentation for your exact model before ordering this reference.\n<\/p>\n<h3>When to replace the Astralpool o-ring 4405010439<\/h3>\n<p>\nO-rings are consumable parts and gradually lose elasticity due to pressure cycles, temperature changes and exposure to pool chemicals. A<br \/>\ntired or damaged seal can allow leaks or air entry, which quickly affects filtration comfort and pump behaviour.\n<\/p>\n<ul>\n<li>Flattened, shiny appearance indicating long term compression in the groove.<\/li>\n<li>Visible cracks, cuts or rough areas on the o-ring surface.<\/li>\n<li>Persistent drips at the joint even after careful cleaning and tightening.<\/li>\n<li>Air bubbles visible in transparent sections or under pump lids during operation.<\/li>\n<\/ul>\n<h3>Installation and maintenance tips<\/h3>\n<p>\nFitting the Astralpool o-ring 38 x 5 mm 4405010439 is simple, but careful preparation helps ensure a reliable seal and longer service<br \/>\nlife. The system must always be switched off and depressurised before opening any sealed component.\n<\/p>\n<ul>\n<li>Isolate the pump, close valves and release pressure from the relevant section.<\/li>\n<li>Remove the old o-ring and clean the groove and mating faces to remove dirt and scale.<\/li>\n<li>Check that the new o-ring is clean, undamaged and sits naturally in the groove.<\/li>\n<li>Place the seal gently into position, making sure it is not twisted or overstretched.<\/li>\n<li>Optionally apply a thin film of silicone based lubricant suitable for pool seals to ease assembly.<\/li>\n<li>Reassemble the parts and tighten evenly by hand, avoiding excessive force that could crush the o-ring.<\/li>\n<\/ul>\n<p>\nAfter restarting filtration, inspect the joint for a few minutes to confirm that the area remains completely dry and that there are no<br \/>\nsigns of air being drawn into the circuit.\n<\/p>\n<h3>Good practice for long term sealing<\/h3>\n<p>\nA few regular habits help the Astralpool o-ring 38 x 5 mm 4405010439 deliver effective sealing performance over many seasons.\n<\/p>\n<ul>\n<li>Maintain balanced water chemistry to limit chemical stress on elastomer seals.<\/li>\n<li>Clean sealing surfaces before closing unions or caps to avoid pinching grains of sand.<\/li>\n<li>Do not use tools to overtighten closures; hand tightening is usually sufficient.<\/li>\n<li>Replace seals preventively during major services instead of waiting for visible leaks.<\/li>\n<\/ul>\n<p>\nWith a correctly installed Astralpool o-ring 38 x 5 mm 4405010439, compatible fittings regain secure, watertight joints that support<br \/>\nstable, efficient filtration in daily pool operation.<\/p>","protected":false},"excerpt":{"rendered":"<p>Astralpool o-ring 38 x 5 mm 4405010439 The Astralpool o-ring 38 x 5 mm 4405010439 is a replacement elastomer seal designed to restore watertight joints on compatible Astralpool pool equipment. With an internal diameter of approximately 38 mm and a 5 mm cross section, it fits precisely in its dedicated groove and provides a reliable,<a href=\"https:\/\/www.poolparthub.com\/nl\/product\/astralpool-o-ring-38-x-5-mm-4405010439\/\">Continue reading <span class=\"sr-only\">&#8220;Astralpool o-ring 38 x 5 mm &#8211; 4405010439&#8221;<\/span><\/a><\/p>","protected":false},"featured_media":8794,"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-8792","product","type-product","status-publish","has-post-thumbnail","product_brand-astralpool","product_cat-spare-parts","first","onbackorder","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 38 x 5 mm dimensions for Astralpool parts that specify 4405010439 "},{"text_details_type":"yes","text_details_product":"Restores watertight and airtight sealing on compatible unions or caps \t"},{"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 quickly 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 material still ages over time and must 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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