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🔩 Upgrade your plumbing game with pro-grade inserts that keep leaks out and confidence in.
The 12mm John Guest Inserts (Pack of 50) are precision-engineered brass fittings designed to reinforce semi-rigid 12mm outer diameter water pipes. Suitable for both hot and cold applications, these inserts prevent leaks by strengthening pipe ends and compensating for imperfect cuts. Ideal for professional and DIY plumbing projects, this bulk pack ensures durability, reliability, and easy installation.





| ASIN | B09LHRWNVF |
| Best Sellers Rank | 4,000 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 61 in Pipe Fittings |
| Brand | John Guest |
| Colour | White |
| Connector Type | Insert |
| Connector type | Insert |
| Country of Origin | United Kingdom |
| Customer Reviews | 4.6 out of 5 stars 170 Reviews |
| Item Dimensions | 12 x 12 x 4.5 centimetres |
| Item dimensions L x W x H | 12 x 12 x 4.5 centimetres |
| Manufacturer | John Guest |
| Material | Plastic |
| Number of Packs | 1 |
| Number of Pieces | 50 |
| Size | 12mm |
| Thread Size | 3/8 inch |
| Thread Type | UN |
| Unit Count | 1.0 count |
D**W
Improves reliability and longevity of 12mm push fit pipes
I use these on the ends of 12mm push fit pipes for both hot and cold. They’re recommended for hot but they’re so cheap, why not use them for cold too ? Easy to fit and they resolve any issues where the pipe isn’t cut 100% straight.
D**E
John quest
Received with thanks I can now go to replace the pipe work on our caravan now I have been putting off for a while very pleased great quality and will be ordering more items soon
A**R
Pipe plug
Did the job purchased for with ease
B**N
Grat value
Good quality and great value.
P**L
Fit great 👍
Fit great
T**S
JG quality items.
JG inserts, essential to guarantee water tight fittings, especially in high vibration environments like a camper. Easy to use, cut the pipe, push in the insert, push over the fitting.
P**L
It works
OK bit of kit
R**.
Do what they are supposed to do, just expensive!
Good quality inserts as you expect from John Guest but you pay the premium price for the name.
N**.
Tut genau was es soll
Wie beschrieben, ohne Dichtung!Gute Qualität im praktischen 50er-Pack, die Hülsen stabilisieren das 12-mm-Rohr wie erwartet. Man sollte nur wissen, dass diese Variante ohne eigene Dichtung geliefert wird. Das ist für Standardanwendungen auch völlig ausreichend, da die Abdichtung ohnehin über den O-Ring im Fitting selbst läuft. Wer eine zusätzliche Absicherung sucht, muss zu den Superseal-Einsätzen greifen – diese haben im Gegensatz zu diesen normalen Hülsen noch eigene, integrierte Außen-O-Ringe für eine doppelte Dichtung. Für den normalen Einsatz reichen diese hier aber locker. Passt und hält dicht!
D**X
T E U E R
ja es funktioniert, aber was soll dieser unverschämte preis
Trustpilot
2 months ago
1 week ago