




🔩 Upgrade your plumbing game—because leaks are so last season!
The 12mm John Guest Inserts (Pack of 50) are precision-engineered brass fittings designed to reinforce 12mm semi-rigid water pipes. Compatible with both hot and cold water systems, these inserts prevent leaks by strengthening pipe ends and accommodate slight imperfections in pipe cuts. Ideal for professionals and DIY enthusiasts alike, this bulk pack ensures reliability and longevity in plumbing installations.







| ASIN | B09LHRWNVF |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 1,339 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 12 in Pipe Fittings |
| Colour | White |
| Customer Reviews | 4.7 4.7 out of 5 stars (133) |
| Date First Available | 10 Nov. 2021 |
| Item Weight | 40 g |
| Manufacturer | John Guest |
| Material | Brass |
| Number of Pieces | 50 |
| Product Dimensions | 12 x 12 x 4.5 cm; 40 g |
| Size | 12mm |
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.
Trustpilot
1 month ago
2 weeks ago