Jackd1

Yes thankyou @DUKE that worked perfectly, I also smeared vaseline around the edges of where the NRV fits to try to double water tight the area, I also used condoms as had no balloons and seems to be working fine.... Although was an interesting conversation with the wife when she came home from work to find me sat in the hot tub with two condom wrappers and a tub of vaseline on the side 🙄