The UltraZAP 50mm hosetail reducer can be reduced to 40mm, 32mm, 25mm, 20mm or 16mm, by simply cutting off the hosetail section where applicable.
For use with UltraZap Bio Filter Chambers (search UltraZAP on Rebel Pets) and others.
Use PVC Cleaner to clean and PVC Cement to glue PVC pipe to the reducer.
George Dannhauser (verified owner) –