I think its becasue they use cheap chinee taps. You can get them for around 5 or so dollars. I have the same tap but it has two female threads. And I bought it from Pirtek from memory. Hasn't leaked a drop. I considered a Bunnings irrigation tap but being all plastic and my drain hose runs down and out at the rear section of the front guard and along the chassis rail for ease of draining, I was concerned it may get damage to easy. @Hodge, its just a ball valve. Nothing really special about it....