Without checking, what thread type is on your sand filter valve? Not a clue? Do not worry, you are not the only one.
The connecting joint of a multiport valve is an afterthought to most pool owners; likely there are more pressing matters, water chemistry, air leaks and the like. The only time we notice the thread type is the third time we try screwing on a new replacement valve. That is exactly when we see that the thread on the tank is a buttress but valve is a V-thread. That is $80 for the valve down the drain. not literally of course, because the drain is not working as a result of your filter is being out of commission. And that is where we come in.
The trickiest part is that only some filter tanks can use all three of these forms. It depends on certain factors i.e. model, year, or specific type. For example the Pentair Tagelus uses all three. (more…)