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John Guest Female Adapter - 3/8" Female BSP x 8mm Push Fit

SKU: PM450813E
In stock

Price:
Sale price£4.79
Price:
Sale price£4.79

“The filter adapter works great. This is a replacement for an adapter for a Grohe tap that snapped when I assembled it. It was very hard to find a 15mm to 8mm push fit adapter, so I am very pleased I found it and that it works well.”

Guaranteed to Fit

Perfect fit guaranteed on all recommended products – or you’ll get a full refund.

Unsure if it’s the right fit? Ring us on 0161 768 9566 or email us.

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FREE Express Delivery: Orders over £50 to UK mainland
Next Day Delivery: £5.99 (order before 3pm)
Standard Delivery: £2.99 for 2-3 working days

Will It Fit?

Suitable for potable domestic and commercial water applications including softening, conditioning, filtering, reverse osmosis, cleaning, sanitising, and more."

SKU: PM450813E 



Fitting model number: PM450813E

Description

Shipping

  • Orders ship within 1 business day (Mon–Fri, excl. holidays).
  • You’ll get an email as soon as your order is on its way.

Delivery Options

  • FREE Express Delivery on UK orders over £50
  • Next Day Delivery – £5.99 (order before 3pm)
  • Standard Delivery – just £2.99

Click here for international details.

Our Water Quality Promise

If your tap is starting to taste like bleach, leaving white flakes on your kettle, or turning your hair into hay, his is where Filter Flair steps in.

1. Better Taste

  • Removes chlorine and other off-flavours with multi-stage cartridges so you can enjoy fresh, crisp water straight from your tap.

2. Bye-Bye Limescale

  • Scale-control systems stop limescale before it clogs kettles, showers, and appliances.

3. Safer, Cleaner Water

  • WRAS, NSF, WQA-certified filters block microplastics, heavy metals, and other contaminants so you can sip with confidence.

4. Kinder to Skin & Hair

  • Reduces chlorine for softer skin and smoother hair — without fancy lotions.

Fast fact: The best water is judged by taste, not spreadsheets — and ours gets top marks.. Multi-stage filters are science-approved to zap impurities and deliver clean, crisp hydration.

Pro tip: Change your cartridge every 3–6 months, or sooner if the flow slows or the taste changes.

Filter Flair
OEM Brands
Other Online Sellers
Perfect Filter Guarantee
✅ Always fits or your money back
✅ Fits (official product)
❌ Risk of wrong/ incompatible filter
Delivery Speed
✅ Next-day tracked delivery available
❌Often slower, limited stock
❌Unpredictable shipping times from abroad.
Customer Service
✅ UK-based, 7-Day Specialist Support
❌ Outsourced India-based centres
❌ Unskilled AI chatbot support
Price and Value
✅ Lower price, same OEM reliability
❌ Sticker price with no savings
❌ Unskilled AI chatbot support
Credibility
✅ 900+ Verified 5-star reviews
✅Big brand reputation
❌ Mixed reviews with doubts on authenticity

Fit & Compatibility

How do I know if this filter fits my fridge?
Use our “Compatibility Check” on the website. Enter your fridge’s model number and we’ll show you the exact filter you need.

Where can I find my fridge’s model number?

Most fridge model numbers are on a label inside the fridge (usually behind the crisper drawer, on the side wall, or near the door frame). See our guide here. If you can’t find it, check your user manual.

What if the filter doesn’t fit?


You’re covered by our Perfect Fit Guarantee. If it doesn’t fit, we’ll replace it or refund you, no hassle.

Can I use a non-OEM filter in my fridge?

Yes, Certified Compatible Filters are engineered to meet or exceed OEM standards, while offering the same fit and filtration performance—at a better value.

Usage & Maintenance

How often should I replace my filter?

Every 6 months, or sooner if your water has a noticeable taste or odour.

How do I install the filter?

Each filter comes with step-by-step instructions. Most simply twist or click into place—no tools required.

What happens if I forget to replace it on time?


Old filters can clog, slowing water flow and letting impurities through. Regular replacement ensures fresh, clean water and ice.

How do I know when my filter needs changing?


Look out for:

  • Water tasting or smelling off
  • Slower water flow
  • Your fridge’s “change filter” light switching on

Performance & Safety

Do these filters remove chlorine, lead, and microplastics?


Yes, our filters reduce chlorine, lead, and other common contaminants, including microplastics, so your water tastes better and is safer to drink.

Is water in the UK safe to drink without a filter?


Tap water in the UK is safe and regulated. A filter isn’t required—but it improves taste, reduces micro-contaminants, and gives extra peace of mind.

What’s the difference between OEM filters and Filter Flair alternatives?


OEM = “Original Equipment Manufacturer.” Filter Flair alternative filters deliver the same quality, compatibility, and certifications, but at a fraction of the price.

Are your filters certified (WRAS, NSF, WQA)?


Yes, all Filter Flair filters are independently tested and certified to meet WRAS, NSF, and WQA standards.

Delivery & Subscription

How quickly will my filter be delivered?


Orders are processed within 1 business day. Express UK delivery arrives in 2–3 days, and Next-Day delivery is available if you order before 3pm. For more information visit our shipping policy page

How does Subscribe & Save work?


Pick your filter, and get it delivered every six months while saving up to 10%. 

Can I pause or cancel my subscription anytime?


Yes, you’re in control, you can pause, change, or cancel anytime from your account dashboard.

How does international shipping work?


We ship worldwide. Costs and delivery times vary depending on the destination—calculated at checkout. See more information on our shipping policy page 

Trust & Assurance

Why choose Filter Flair over others?

  • Perfect Fit Guarantee
  • Genuine OEM & Certified Filters
  • Fast UK delivery
  • Subscribe & Save discounts
  • Excellent UK-based support, 7 days a week

What is the ‘Perfect Fit Guarantee’?


If your filter doesn’t fit or perform as promised, we’ll replace it or refund you in full. No risk, no hassle.

What if I need help choosing the right filter?


Use our simple Compatibility Checker or get in touch and we’ll help you find the perfect match for your fridge.

How can I get in touch with Filter Flair?


Get in touch via the ‘Contact Us’ page on our website or email our UK support team at support@filterflair.co.uk. Alternatively, give us a call on +44 (0)161 768 9566 or contact our live chat here.

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Customer Reviews

Based on 12 reviews
83%
(10)
8%
(1)
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8%
(1)
J
Jonathan M (Sheffield, GB)
Great Service

Same day dispatch and next day delivery at a reasonable price ensured that I was able to fix a leak quickly. One of the few places to sell a 3/8" Female BSP x 8mm Push Fit adaptor.

Jonathan,

Thank you so much for your kind review! We're really glad to hear that our same-day dispatch and next-day delivery helped you sort out the leak quickly—that's exactly what we aim for. It's also great to know we had the specific 3/8' Female BSP x 8mm Push Fit adaptor you needed.

We sincerely appreciate your support and hope to have the opportunity to serve you again in the future. If you ever need anything else, we're here to help!

Best Regards,
Brian
Filter Flair UK

K
Kyle Hein (Islington, GB)
Never arrived

Never arrived

P
Peter Clawson (Wallington, GB)
Good service, parts exactly what I needed

Prompt delivery and refunded on non fitting filter head. Easily sorted. Good customer service response.

Hi Peter,

Thank you for taking the time to leave us a review. We are delighted to hear that our product met your needs and that you were satisfied with our prompt delivery and customer service.

We apologize for the inconvenience with the non-fitting filter head and are glad to hear that our team was able to resolve the issue for you. Your satisfaction is our top priority and we are always happy to assist in any way we can.

Thank you for choosing our John Guest Female Adapter. We hope to have the opportunity to serve you again in the future.

Warm Regards,
Brian
Filter Flair UK

P
Philip Carthew (Leicester, GB)

Good fit for Brita filter.

Philip,

Thank you for taking the time to leave a review for our John Guest Female Adapter. We are delighted to hear that this product was a good fit for your Brita filter. We strive to provide high-quality products that meet the needs of our customers.

Your kind words are greatly appreciated and we are grateful for your support. We hope to have the opportunity to serve you again in the future and provide you with the same level of satisfaction.

Best regards,
Brian
FIlter Flair UK

G
Graham Harper (London, GB)
Fixed my filter leak

Been getting a dribble and then a full leak on my Brita water filter. Changed the two pipe adaptors and it fixed the problem immediately.

Free UK delivery over £50

Just £2.99 for anything less.

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