None , JG is used in many Build's with many manufactured vans using it with one but ,,,,it's all 12 mm not 15 mm
You need reducer's 15 mm to 12 mm to connect to anything you have in the van. Thinking along the lines of Boiler, Water pump, loo, Shower, Taps, etc. Everything is 12 mm in a van so work out if it's worth buying 12mm for ease.
I got a lot of reducer's and used them along with 15 mm pipework in a few of my builds along side of Household Taps ( a lot better than "caravan taps" ) so no reducer's required for them but Boiler and water pump and Loo need them
Edit 15 mm is a lot cheaper than 12 mm
Thanks Terry, I can of thought that was the case but it's always nice to know someone else has done it. I imagine as long as its clipped in well it should handle the truck movement. I am using all domestic taps and shower coupled to a shurflo 30psi 10lpm pump with accumulator, so should only need a few reducers.
Hi, you will need reducer's for water pump, Boiler and Loo. or depending on distances you could buy a couple of mtrs of 12 mm pipe,say pump to Boiler may be cheaper than reducer's
Last time I bought JG 12mm pipe it worked out just over £1 a MTR and JG reducers were about £4 each but I bought loads off a mate who worked for Bartol plastic for £1 ,,,,not JG but work
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