Products - Details Regulating Stopcocks Description: Effient polypropylene (PP) stopcock Excellent chemical and temperature resistance Item No. Description Unit Price Quantity Add to Cart SWQ036 Stopcock, Regulating, 3/8" BSP Thread, PP Each $34.70 SWQ038 Stopcock, Regulating, 1/2" BSP Thread, PP Each $29.50 SWQ040 Stopcock, Regulating, 3/4" BSP Thread, PP Each $37.30