Oventrop single line Oventrop oil filter Oilpur 2123561 3 / 8IGx3 / 8AG, Siku 50-75 my, shut-off valve. Oventrop heating Oventrop filter for single line systems with Oventrop closing shut-off valve. With double O-ring seal. With mounting bracket. Housing and union nut made of brass. Cellidor filter cup. For suction operation only.