Collins Red Dump Valve and Fitting Kit for Vauxhall Astra SRi GSi Mk4 G Turbo. Anodised finish high-quality UK made alloy dump valve. Made in UK to high standards. Supplied with alloy T piece, hose, jubilee clips, plastic t piece (See second picture to see what you actually get). Designed to give your car that distinctive proper dump valve noise! Also suitable for any Vauxhall Turbo engine with 57mm inlet, C20LET turbo conversions or Z20LET turbo conversions.