This product is suitable for 30 teeth vernier adaptor for 20 teeth spline Bristan Spline Adaptor (8/20 To 11/30) - Apt 04895 BS5412 L20 895 TC6725 BLANCO 123743. Tap Magician are the UK experts in ceramic disc tap cartridges and leaky taps. We offer high quality fully compatible tap valve spares for most UK kitchen, basin, bath and shower mixers. Easily repair and doctor your leaking or dripping hot and cold taps. Traditional or ceramic valve type. We have experienced advisors available for any technical support you need help or advice with. We stock the spare parts for all of our valves for easy and cheap low cost future maintenance (ceramic disc internals and silicone seals and washers and o'rings). We offer a 12 month warranty on all of our products.