{"product_id":"sight-glass-1","title":"Waterway Sight Glass 873-E17S1","description":"\u003cp\u003eThe Waterway 873-E17S1 is a replacement sight glass, the clear window fitted to a filter valve so you can see the water going through it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat you use it for\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWhen you backwash, water leaving the filter starts dirty and gradually clears. The sight glass is how you know when to stop, rather than guessing at a time and either cutting the backwash short or dumping more water than the job needed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBefore you order\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWaterway classes this as a filter valves part and catalogs it with the 2 inch side mount Crystal Water DE filter valves WVD001 and WVD002. Sight glass sizes and threads are not interchangeable across valve families, so take the old one out and compare it before ordering.\u003c\/p\u003e","brand":"Waterway","offers":[{"title":"Default Title","offer_id":48633454690516,"sku":"WWP-061-1011","price":6.08,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/9568\/2516\/files\/default_919e0608-4b9c-4de7-bee2-30c9f2389437.jpg?v=1788804973","url":"https:\/\/www.activepoolsupply.com\/products\/sight-glass-1","provider":"Active Pool Supply","version":"1.0","type":"link"}