Plunger valve

Welcome to TFP.

There are pictures on the net and youtube videos If you search on “Krystal’s clear sand filter pump“. Post pictures of what you have and show us where you need help.
 
Intex uses two hose sizes, at least here in the US. Many smaller pools and pumps use smaller 1.25 inch hoses. These hoses are usually clear and connected to the pool or pumps with hose clamps. The larger pools and pumps use larger 1.5 inch hoses. These hoses are usually white and have fittings that screw on to attach to the pool or pumps.

It‘s likely that your pool has the 1.25 inch hose connections and your new pump and filter have 1.5 inch hose connections. They do sell adapters that will allow you to connect the two together.
 
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