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John Guest Union 3/8" Part # PI0412S Free Ship


John Guest Union Connector 3/8" Part # PI0412S 

    ✔️ This fitting uses quick connect fittings that make the connections easy to install and remove.

      *Great News!  You can Mix & Match ALL John Guest Products to take Advantage of our Quantity Breaks Pricing!

      Product Number PRT PI0412S


      All products include FREE standard shipping in Canada!

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      About John Guest

      John Guest Holdings is a British-based manufacturer of push-fit fittings, tubes, and other fluid control products. The company was founded in 1961 by John Guest, an engineer, and businessman, with the goal of creating innovative and high-quality push-fit fittings. Today, the company is a leading manufacturer of push-fit fittings and fluid control products in the world, and its products are used in a wide range of industries, including plumbing, heating, air conditioning, and medical equipment.

      What is the John Guest brand famous for?  It offers some of the best pioneering products ever that include Speedfit quick-connect fittings with fantastic food grade tubing in their fluid dispense products. According to their website, it is also the world’s leader in plastic push-fit fittings, tubing and fluid control products resulting from 60+ years of engineering innovation, quality, and technology since 1961.

      John Guest is one of the brands from Reliance Worldwide Corporation™ (RWC), who is an industry leader and manufacturer of water control systems and plumbing solutions for residential, commercial and industrial applications.  Their brands include: Cash Acme; EZ-FLO and Eastman; HoldRite; John Guest; and SharkBite.   They employ over 2,000 people across 44 locations and serve over 60 countries worldwide. 

      Water eStore carries John Guest products for various applications.  We vet our suppliers and personally test all John Guest products, installing them in our homes (where applicable) and monitoring their performance daily. They have earned their reputation as innovative products with top notch customer service.  

      John Guest products are easy to install and service. We offer YouTube videos that support John Guest products explaining how they work, how to install and service. We also offer a 100% money back guarantee if you’re not satisfied with your investment in John Guest products for your family.


      See all from John Guest

      Shipping Policy

      We offer FREE Shipping anywhere in Canada. Once your order is placed, we process it the next business day and ship via ground transportation. In very remote locations, whenever the shipping costs become prohibitive we reserve the right to either cancel the order or ask that you contribute to the shipping costs, it's up to you. Your items may take anywhere from a few days up to a few weeks to arrive.

      If you have any special shipping requirements, like requiring a signature at time of delivery, please leave a message in the "Special instructions for seller" section while checking out. If you order multiple products they may not all arrive at the same time as we ship from multiple warehouses and each item will be shipped directly to you. If no one is home when your order is delivered it will be left for you but we cannot assume responsibility for your order once it has been dropped off.

      If you have any questions please contact us at

      Thank you for your order, we appreciate your business!


      Excluded Items

      We do not offer refunds or returns on items built to order including Aclarus Ozone systems, Reverse Osmosis systems larger than 500 gpd or water softeners/iron filters over 1 cubic foot. 


      Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately, we can’t offer you a refund or exchange.

      To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

      To complete your return, we require a receipt or proof of purchase.

      Please do not send your purchase back to the manufacturer.


      Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.

      If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.

      Late or missing refunds

      • If you haven’t received a refund yet, first check your bank account again.
      • Then contact your credit card company, it may take some time before your refund is officially posted.
      • Next contact your bank. There is often some processing time before a refund is posted.
      • If you’ve done all of this and you still have not received your refund yet, please contact us at

      Sale items

      Only regular priced items may be refunded, unfortunately, sale items cannot be refunded.


      We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at and send your item to: The Water Store 1004 King Street Midland Ontario CA L4R0B8.


      To return your product, you should mail your product to:

      The Water Store
      1004 King Street
      Midland Ontario CA L4R0B8

      You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.

      Depending on where you live, the time it may take for your exchanged product to reach you, may vary.

      If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.

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