21mm nylon couplers/joiners to suit 21mm Nylon flexible conduit.Ingress Protection - IP68Thread Size M20 x 1.5mmTHCC21NP – Nylon PA6 Flexible Conduit 21mm CouplerSKU: THCC20NP£6.09PriceNext Day UK DeliveryQuantityAdd to Cart & Pay By CardPayPal & Google Pay Checkout