Aqualona Mainstream Duroplast Toilet Seat White (32 ratings) Aqualona Mainstream Duroplast Toilet Seat Black £22.99 High Quality Duroplast Toilet Seat. White. 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: White Material: Duroplast. Dimensions: Overall Height Top to Bottom: 46 Centimetres. Overall Width - Side to Side: 37 Centimetres. Overall Depth - Front to Back: 46 Centimetres.