Features: Diaphragm only For low consumption urinals 1.0 gallon per flush 3.8 litre per flush Green relief valve Black refill head Slotted flow ring Product Variations: 3301502 - 1.6 GPF Diaphragm only for low consumption water closets 3301501 - 3.5 GPF Diaphragm only for water saver water closets 3301505 - 2.4 GPF Diaphragm only for European water closets 3301504 - 0.5 GPF Diaphragm only for wash down urinals 3301503 - 1 GPF Diaphragn only for low consumption urinals (This Model) 3301500 - 1.5 GPF Diaphragn only for water saving urinals 3301506 - 1.28 GPF Diaphragm only for high efficiency water closets 3301142 - 0.25 GPF Diaphragm only for high efficiency urinals 3301143 - 0.125 GPF Diaphrapm only for high efficiency urinals