Home / Shop By Part Type / Lighting & Electrical / Plug cap, with resistor. Plug cap, with resistor. £6.20 £7.44 (inc. VAT) £8.00 Add to your Wish List Info Reviews Spark plug cap in EPDM rubber with integral 5KOhm resistor; totally waterproof! Fits 6.40mm spark plug nut. Made in Italy. Not yet reviewed Write an online review and share your thoughts with other shoppers! Be the first to review this product.