Got some 18m x 40mm push fit, to try to improve the French drain, around my workshop and garage, following the recent monsoons. Idea is to dig out the old gravel, wash the mud out of the gravel, drop the push-fit in, surrounded by clean gravel, then put old plastic guttering overall. The push-fit, then leads the water slightly down hill, away from my workshop and garage. I made lots of holes in the push-fit, to allow the water to get in.