Aqualona Mainstrem Duroplast Toilet Seat Balck Aqualona Mainstrem Duroplast Toilet Seat Balck Aqualona Mainstream Duroplast Toilet Seat Black (28 ratings) Aqualona Mainstream Duroplast Toilet Seat Black £20.99 Out of stock. High Quality Duroplast Toilet Seat. Black. Features: -Soft close one button release durable toilet seat. Soft close - avoids slamming and damage to seat universal fixings. Easy to clean single press button realease, to improve cleaning & hygiene. Rust resistant stainless steel 360° adjustable hinges. Colour: Black Material: Duroplast. Dimensions: Overall Height Top to Bottom: 46 Centimetres. Overall Width - Side to Side: 37 Centimetres. Overall Depth - Front to Back: 46 Centimetres.