These box style valves replace water lost due to evaporation or small leaks in ponds and Just-A-Falls systems. Mount inside skimmer or the water fill box, which is shown above. This durable fill valve is ideal since the float is contained inside the valve box. No chance of damaging unit when lifting pumps in or out of skimmer. Includes fitting to connect to 1/2? vinyl tubing. Fits in small or large skimmer. Measures 7 1/2? long x 3? wide x 4? high.